Multi- or dual-headed compositions useful for chain shuttling and process to prepare the same

ABSTRACT

The present disclosure relates to a process for synthesizing multi- or dual-headed compositions having the formula R 1 M A [R 2 M A -] N R 1  by employing a sterically hindered compound and an organometallic compound in the presence of a transition metal catalyst. The present disclosure further relates to use of the compositions, as well as the process to make the same, in olefin polymerization.

FIELD

Embodiments relate to multi- or dual-headed compositions useful for chain shuttling and a process to prepare the same. In one aspect, the compositions can be used in olefin polymerization.

INTRODUCTION

The properties and applications of polyolefins depend to varying degrees upon the specific features of the catalysts used in their preparation. Specific catalyst compositions, activation conditions, steric and electronic features, and the like all can factor into the characteristics of the resulting polymer product. Indeed, a multitude of polymer features such as co-monomer incorporation, molecular weight, polydispersity, and long-chain branching, and the related physical properties, such as density, modulus, melt properties, tensile features, and optical properties, can all be affected by catalyst design.

In recent years, advances in polymer design have been seen with the use of compositions useful for chain shuttling. Such compositions have reversible chain transfer ability which can exchange a growing polymer chain between different catalytic sites such that portions of a single polymer molecule are synthesized by at least two different catalysts. Currently, the best known compositions useful for chain shuttling are simple metal alkyls that typically contain only a single point of attachment to the metal for each polymer chain, such as diethyl zinc which produces polymer chains terminated with zinc metal at one end. More sophisticated compositions useful for chain shuttling, such as multi- or dual-headed chain shuttling agents (CSAs), with the alkane moiety attached to two metals, are also known. Indeed, multi- or dual-headed CSAs are of great interest since they can enable the production of new polyolefins, such as telechelic functional polymers.

While feasible methods to synthesize multi- or dual-headed CSAs have been reported, there is still a need for a commercially viable process for producing such compositions that is not hindered by high costs and tedious, complex procedures.

SUMMARY

In certain embodiments, the present disclosure provides for a process for synthesizing multi- or dual-headed compositions by employing a catalyst precursor, a sterically hindered diene, and an organometallic compound. In certain embodiments, the present disclosure provides an economical and practical process for preparing a multi- or dual-headed composition, the process comprising the steps of:

-   -   contacting a sterically hindered diene with an organometallic         compound, a solvent, a catalyst precursor and a co-catalyst to         form a final solution comprising the composition,         wherein the composition has the formula:     -   R¹M^(A)[R²M^(A)-]_(N)R¹, or an aggregate thereof, a Lewis         base-containing derivative thereof, or any combination thereof;         wherein:     -   M^(A) in each occurrence is Zn, Mg, Ga, or Al;     -   R¹ in each occurrence is independently selected from hydrogen,         alkyl, halide, amide, hydrocarbyl, hydrocarbylamide,         dihydrocarbylamide, hydrocarbyloxide, hydrocarbylsulfide,         dihydrocarbylphosphido, tri(hydrocarbyl)silyl; any hydrocarbyl         group being optionally substituted with at least one halide,         amide, hydrocarbylamide, dihydrocarbylamide, or         hydrocarbyloxide; and each carbon-containing R¹ having from 1 to         50 carbon atoms, inclusive;     -   R² in each occurrence is a derivative of the sterically hindered         diene; and     -   N, on average, is a number from 1-150, inclusive.

In further embodiments, the present disclosure provides for a multi- or dual-headed composition having the formula:

-   -   R¹M^(A)[R²M^(A)-]_(N)R¹, or an aggregate thereof, a Lewis         base-containing derivative thereof, or any combination thereof;         wherein:     -   M^(A) in each occurrence is Zn, Mg, Ga, or Al;     -   R¹ in each occurrence is independently selected from hydrogen,         halide, amide, hydrocarbyl, hydrocarbylamide,         dihydrocarbylamide, hydrocarbyloxide, hydrocarbylsulfide,         dihydrocarbylphosphido, tri(hydrocarbyl)silyl; any hydrocarbyl         group being optionally substituted with at least one halide,         amide, hydrocarbylamide, dihydrocarbylamide, or         hydrocarbyloxide; and each carbon-containing R¹ having from 1 to         50 carbon atoms, inclusive;     -   R² in each occurrence is a derivative of a sterically hindered         diene; and     -   N, on average, is a number from 1-150, inclusive.

In further embodiments of the above composition, R¹ in each occurrence is hydrogen or a C1-20 alkyl group.

In practice, N is the average that describes a sample of molecules and will not necessarily be an integer. For example, N on average can be a number from 5 to 140, from 10 to 125, from 15 to 110, or from 20 to 100, inclusive.

In some embodiments, the present disclosure provides for a catalyst composition comprising the contact product of at least one catalyst precursor, at least one co-catalyst, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. In further embodiments, the present disclosure provides for a process for preparing a catalyst composition, the process comprising contacting at least one catalyst precursor, at least one co-catalyst, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, as described above. In further embodiments, the present disclosure provides for a process for preparing a catalyst composition, the process comprising contacting at least one catalyst precursor, at least one co-catalyst, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, as described above, wherein the at least one catalyst precursor is also the catalyst precursor used for preparing the at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹.

In some embodiments, the present disclosure provides for a process for the polymerization of at least one addition polymerizable monomer to form a polymer composition, the process comprising: contacting at least one addition polymerizable monomer with a catalyst composition under polymerization conditions, the catalyst composition comprising the contact product of at least one catalyst precursor, at least one co-catalyst, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, as described above. In further embodiments, the present disclosure provides for a process for the polymerization of at least one addition polymerizable monomer to form a polymer composition, the process comprising: contacting at least one addition polymerizable monomer with a catalyst composition under polymerization conditions, the catalyst composition comprising the contact product of at least one catalyst precursor, at least one co-catalyst, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, as described above, wherein the at least one catalyst precursor is also the catalyst precursor used for preparing the at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 portrays exemplary catalytic processes for forming compositions of the present disclosure.

FIG. 2 portrays exemplary sterically hindered dienes in accordance with the present disclosure.

FIG. 3 portrays exemplary structures of dual headed compositions using different organozinc compounds.

FIG. 4 provides ¹H NMR analysis of Working Example 1.

FIG. 5 provides GCMS analysis (Method 1) for samples of Working Example 1 quenched with water.

FIG. 6 provides GCMS analysis (Method 2) for samples of Working Example 1 quenched with water.

FIG. 7 provides GCMS analysis (Method 2) for samples of Working Example 1 quenched with methanol.

FIG. 8 portrays plausible reactions for the samples of Working Example 1 quenched with water or CD₃OD.

FIG. 9 provides GCMS analysis (Method 2) for samples of Working Example 1 quenched with CD₃OD.

FIG. 10 provides a GPC curve of EO copolymer made with the dual-headed composition of Working Example 1.

FIG. 11 provides ¹H NMR analysis of 5-vinyl-2-norbornene reacted with diethylzinc and Catalyst (A2).

FIG. 12 provides GCMS analysis (Method 1) of norbornadiene reacted with diethylzinc and Catalyst (A5).

FIG. 13 provides GCMS analysis (Method 1) of norbornadiene reacted with diethylzinc and Catalyst (A7).

FIG. 14 provides GCMS analysis (Method 2) of norbornadiene reacted with diethylzinc and Catalyst (A7).

FIG. 15 provides GCMS analysis (Method 1) of norbornadiene reacted with diethylzinc and Catalyst (A6).

FIG. 16 provides GCMS analysis (Method 2) of norbornadiene reacted with diethylzinc and Catalyst (A6)

FIG. 17 portrays plausible isomeric structures of the 122 species.

DETAILED DESCRIPTION

Embodiments relate to multi- or dual-headed compositions having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, as described above, and a process for preparing the same. In certain embodiments, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ may be a multi- or dual-headed chain shuttling agent. In further embodiments, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ may be a multi- or dual-headed chain transfer agent.

Definitions

All references to the Periodic Table of the Elements refer to the Periodic Table of the Elements published and copyrighted by CRC Press, Inc., 1990. Also, any references to a Group or Groups shall be to the Group or Groups reflected in this Periodic Table of the Elements using the IUPAC system for numbering groups. Unless stated to the contrary, implicit from the context, or customary in the art, all parts and percents are based on weight and all test methods are current as of the filing date of this disclosure. For purposes of United States patent practice, the contents of any referenced patent, patent application or publication are incorporated by reference in their entirety (or its equivalent U.S. version is so incorporated by reference in its entirety), especially with respect to the disclosure of synthetic techniques, product and processing designs, polymers, catalysts, definitions (to the extent not inconsistent with any definitions specifically provided in this disclosure), and general knowledge in the art.

The term “shuttling agent” or “chain shuttling agent” refers to a compound or mixture of compounds that is capable of causing polymeryl transfer between various active catalyst sites under conditions of polymerization. That is, transfer of a polymer fragment occurs both to and from an active catalyst site in a facile and reversible manner. In contrast to a shuttling agent or chain shuttling agent, an agent that acts merely as a chain transfer agent, such as some main-group alkyl compounds, may exchange, for example, an alkyl group on the chain transfer agent with the growing polymer chain on the catalyst, which generally results in termination of the polymer chain growth. In this event, the main-group center may act as a repository for a dead polymer chain, rather than engaging in reversible transfer with a catalyst site in the manner in which a chain shuttling agent does. Desirably, the intermediate formed between the chain shuttling agent and the polymeryl chain is not sufficiently stable relative to exchange between this intermediate and any other growing polymeryl chain, such that chain termination is relatively rare.

“Multi- or dual-headed chain shuttling agents,” such as those disclosed in U.S. Pat. No. 8,501,885 B2 and those known in the art, include species with metal-alkyl bonds that engage in chain transfer during a transition-metal catalyzed polymerization. Because these chain shuttling agents can be oligomeric, can consist of blends of species, or both, it is difficult to precisely describe these agents because, as they are used in solution, the CSA solution typically comprises a complex mixture of different species. Therefore, the useful CSAs disclosed here are typically described using average compositions, average numbers of multi-headed site valencies, average numbers of single-headed site valencies, and ratios of these numbers.

The terms “dual-headed” or “multi-headed” refer to a compound or molecule containing more than one chain shuttling moiety joined by a polyvalent linking group. By way of illustration only, one example of a dual-headed CSA is provided in the compounds of the general formulas R¹—[Zn—R²—]_(N)Zn—R¹ or R¹—[AlR¹—R²-]_(N)AlR¹ ₂, in which R¹ is a monovalent hydrocarbyl group and R² is a divalent hydrocarbadiyl group. In practice, suitable chain shuttling moieties typically include metal centers derived from a metal selected from Groups 2-14 of the Periodic Table of the Elements and having one or more available valencies capable of reversibly binding a growing polymer chain prepared by a coordination polymerization catalyst. At the same time that the chain shuttling moiety binds to the growing polymer chain, the remnant of the polyvalent linking group remaining after loss of the chain shuttling moiety or moieties incorporates or otherwise bonds to one or more active catalyst sites, thereby forming a catalyst composition containing an active coordination polymerization site capable of polymer insertion at one terminus of what was originally the polyvalent linking group. Shuttling of the new polymer chain attached to the linking group back to the chain shuttling moiety effectively grows a fraction of polymer chains containing a linking group and attached to a main group metal CSA at both ends.

The term “derivative” used herein refers to the reaction product of a chemical group after the insertion reaction of said chemical group into metal alkyl bonds. For example, the “R²” in R¹—[Zn—R²—]_(N)Zn—R¹ can define the derivative (i.e., reaction product) of the linking group CH₂═CH(CH₂)₆CH═CH₂ and Zn(Et)₂ to form EtZn[(CH₂C(Et)H(CH₂)₆C(Et)HCH₂)Zn]_(N)Et. In this example, R² is —CH₂C(Et)H(CH₂)₆C(Et)HCH₂—, a derivative of the insertion of linking group CH₂═CH(CH₂)₆CH═CH₂ into Zn-Et bonds.

The term “linking group” is a chemical species whose derivative links multiple metal species together in a molecule by inserting into a metal alkyl bond of each metal. In the above example, CH₂═CH(CH₂)₆CH═CH is a “linking group” which joins N+1 zinc species to form the species EtZn[(CH₂C(Et)H(CH₂)₆C(Et)HCH₂)Zn]_(N)Et.

The term “precursor” used herein refers to a transition metal species that, once combined with an activator co-catalyst, is capable of polymerization of unsaturated monomers. For example, Cp₂Zr(CH₃)₂ is a catalyst precursor, which when combined with an activating cocatalyst, becomes the active catalyst species “Cp₂Zr(CH₃)+” which is capable of polymerization of unsaturated monomers.

“Catalyst precursors” include those known in the art and those disclosed in WO 2005/090426, WO 2005/090427, WO 2007/035485, WO 2009/012215, WO 2014/105411, U.S. Patent Publication Nos. 2006/0199930, 2007/0167578, 2008/0311812, and U.S. Pat. Nos. 7,355,089 B2, 8,058,373 B2, and 8,785,554 B2, all of which are incorporated herein by reference in their entirety. The terms “transition metal catalysts,” “transition metal catalyst precursors,” “catalysts,” “catalyst precursors,” “polymerization catalysts or catalyst precursors,” and like terms are to be interchangeable in the present disclosure.

“Sterically hindered diene” refers to a cyclic diene with at least one double bond being an internal bond on a five-member ring. Accordingly, the at least one internal double bond of the diene is sterically hindered in such a way that consecutive insertion of a second diene into the metal carbon bond at a transition metal catalyst center is prevented, resulting in only one diene sandwiched between two metal atoms.

“Organometallic compound” refers to any compound that contains a metal-carbon bond, R-M.

“Co-catalyst” refers to those known in the art, e.g., those disclosed in U.S. Pat. No. 8,501,885 B2, that can activate the catalyst precursor to form an active catalyst composition.

“Solvent” refers to those known in the art and those known as appropriate by one of ordinary skill in the art for the present disclosures. Suitable solvents include aromatic hydrocarbons, such as toluene, and aliphatic hydrocarbons, such as Isopar™ and heptane.

“Polymer” refers to a compound prepared by polymerizing monomers, whether of the same or a different type. The generic term polymer thus embraces the term homopolymer, usually employed to refer to polymers prepared from only one type of monomer, and the term interpolymer as defined below. It also embraces all forms of interpolymers, e.g., random, block, homogeneous, heterogeneous, etc.

“Interpolymer” and “copolymer” refer to a polymer prepared by the polymerization of at least two different types of monomers. These generic terms include both classical copolymers, i.e., polymers prepared from two different types of monomers, and polymers prepared from more than two different types of monomers, e.g., terpolymers, tetrapolymers, etc.

The term “block copolymer” or “segmented copolymer” refers to a polymer comprising two or more chemically distinct regions or segments (referred to as “blocks”) joined in a linear manner, that is, a polymer comprising chemically differentiated units which are joined (covalently bonded) end-to-end with respect to polymerized functionality, rather than in pendent or grafted fashion. The blocks differ in the amount or type of comonomer incorporated therein, the density, the amount of crystallinity, the type of crystallinity (e.g., polyethylene versus polypropylene), the crystallite size attributable to a polymer of such composition, the type or degree of tacticity (isotactic or syndiotactic), regio-regularity or regio-irregularity, the amount of branching, including long chain branching or hyper-branching, the homogeneity, and/or any other chemical or physical property. The block copolymers are characterized by unique distributions of both polymer polydispersity (PDI or Mw/Mn) and block length distribution, e.g., based on the effect of the use of a shuttling agent(s) in combination with catalysts.

General Catalytic Process of Composition Formation

The present disclosure relates to a process for synthesizing multi- or dual-headed compositions having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ by employing a sterically hindered diene and an organometallic compound in the presence of a transition metal catalyst. In certain embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ comprises: contacting a sterically hindered diene with an organometallic compound, a co-catalyst, a solvent, and a catalyst precursor to form a final solution comprising the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. In certain embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ comprises: contacting a linking group with an organometallic compound, a co-catalyst, a solvent, and a catalyst precursor to form a final solution comprising the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, wherein the linking group is a sterically hindered diene. In further embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ comprises: (a) contacting a sterically hindered diene and an organometallic compound with a solvent to form a first solution; and (b) contacting the first solution with a catalyst precursor and a co-catalyst to form a final solution comprising the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. In further embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ comprises: (a) contacting a linking group and an organometallic compound with a solvent to form a first solution; and (b) contacting the first solution with a catalyst precursor and a co-catalyst to form a final solution comprising the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, wherein the linking group is a sterically hindered diene.

In certain embodiments, the present disclosure provides for a process for synthesizing a dual-headed composition by employing a sterically hindered diene and an organozinc compound in the presence of a catalyst precursor, whereby the dual-headed composition is generated in-situ through the insertion of the double bonds of the diene at the catalyst precursor center followed by immediate chain transfer to zinc metal. Exemplary, non-limiting processes are illustrated by Schemes 1-3 in FIG. 1.

With reference to Scheme 2 in FIG. 1, in an exemplary process of the present disclosure, the diene double bonds coordinate with the catalyst (1) and insert into the transition metal-carbon bond to form (2), then transfer to alkylzinc to form a dual-headed zinc species (3). The recovered catalyst (1) goes back to the catalytic cycle to react with another diene. The dual-headed zinc species (3) undergoes further chain transfer with (2) using the remaining terminal ZnR2, resulting in “polymeric” dual-headed zinc species (4). The process continues until the diene (or ZnR2 if the diene to Zn ratio is greater than 1) is exhausted. The length (n) of the dual-headed zinc chain is determined by the ratio of diene to ZnR2. The closer the ratio to unity, the greater is the n value and, hence, the molecular weight of the oligomeric dual-headed composition. However, the dual-headed composition is most likely a distribution of chain lengths.

In certain embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ is a one-pot process without any isolation, purification, or separation requirements. In further embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ is a one-pot process; the catalyst precursor (in combination with the co-catalyst) remains as an active catalyst in the final solution, can further function as a catalyst for subsequent polymerization, and need not be removed prior to subsequent polymerization. In certain embodiments, the catalyst precursor has no detrimental effect on subsequent polymerization and is a good higher alpha-olefin incorporating (i.e., good comonomer incorporating) catalyst.

In certain embodiments, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ remains active in the final solution and can further function as a chain shuttling agent during polymerization. Thus, in certain embodiments, the process of the present disclosure is a one-pot process, and the final solution of the process (containing the active catalyst and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹) can be directly used in polymerization reactions without any isolation, purification, or separation requirements and without the requirement of having a removable supported catalyst.

Accordingly, in certain embodiments, the present disclosure relates to a process for the polymerization of at least one addition polymerizable monomer to form a polymer composition, the process comprising: contacting at least one addition polymerizable monomer with a catalyst composition under polymerization conditions; wherein the catalyst composition comprises the contact product of at least one catalyst precursor, at least one co-catalyst, and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. In further embodiments, the present disclosure relates to a process for the polymerization of at least one addition polymerizable monomer to form a polymer composition, the process comprising: contacting at least one addition polymerizable monomer with a catalyst composition under polymerization conditions; wherein the catalyst composition comprises the contact product of at least one catalyst precursor, at least one co-catalyst, and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, and wherein the at least one catalyst precursor is also the catalyst precursor used for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. Said in another way, the catalyst precursor used to form the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ is the same catalyst precursor used for polymerization reactions.

While the catalyst remaining in the final solution can be directly used for polymerization, in certain embodiments, the catalyst in the final solution may optionally be removed from the final solution prior to polymerization by means known to those of ordinary skill in the art, such as passing the final solution through a plug of silica, alumina, or other bed media that will remove the active catalyst without reaction with or removal of more than a small percentage of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. Preferably, the removal process uses dehydrated amorphous silica.

As noted herein, multi- or dual-headed compositions (e.g., multi- or dual-headed CSAs) are of great interest since they can enable production of telechelic functional polymers. Specifically, with reference to the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, the derivative of the linking group, a sterically hindered diene, sandwiched between the two M^(A) groups can grow into a polymer chain with both terminal ends of the chain bonded to the M^(A) groups via terminal polymeryl-metal bonds. Subsequently, the terminal polymeryl-metal bonds may be transformed to desired functional groups via functionalization chemistry, thereby resulting in a desired di-functional polymer chain.

Sterically Hindered Diene

In certain embodiments, the process of the present disclosure requires a single insertion of a diene into the catalyst precursor followed by immediate chain transfer of the inserted diene to the metal of the organometallic compound to form the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. In certain embodiments, selection of the diene is important to meet the one-insertion requirement. In certain embodiments, the diene must be able to coordinate with the transition metal catalyst and insert only once into the metal-carbon to form a 6-bond with the transition metal then immediately transfer to the zinc metal. In certain embodiments, the internal double bond on a five-member ring of the diene is sterically hindered in such a way that the consecutive insertion of a second diene is prevented due to steric hindrance (e.g., the diene can copolymerize with ethylene but is too bulky to insert consecutively), or the rate must be much slower than the rate of chain transfer to zinc metal, resulting in only one diene sandwiched between two zinc metals.

Exemplary sterically hindered dienes in accordance with the present disclosure include, but are not limited to, dicyclopentadiene, 5-vinyl-2-norbornene, norbornadiene, and derivatives of bis-norbornene, as seen in FIG. 2.

Organometallic Compound

In certain embodiments of the process of the present disclosure, the organometallic compound is a metal alkyl. In certain embodiments of the process of the present disclosure, the organometallic compound is a metal alkyl containing a divalent metal (e.g., Zn or Mg), a trivalent metal (Al, B, or Ga), or a mixture of divalent metal and trivalent metal. In certain embodiments, the organometallic compound used in the process of the present disclosure is an organozinc compound. In certain embodiments, the organozinc compound is selected from the group consisting of dialkylzinc compounds (R₂Zn), monoalkylzinc compounds (RZnX, where X is alkoxyl, amino, silyl, phosphine, alkylthio, and halide), and mixtures of R₂Zn and RZnX of any ratio.

In certain embodiments, the structure and size of the compositions of the present disclosure may be tailored as desired via selection of the organometallic compound and ratio of organometallic compound to sterically hindered diene. For example, in some embodiments of the present disclosure, the length of composition can be controlled by the ratio of organozinc compound to diene. For example, a ratio of Et₂Zn to diene greater than 1 would result in a dual-headed chain shuttling agent with ethyl groups on both ends, and each ethyl-Zn would produce a monofunctional polymer chain. If desired, the terminal ethyl-Zn and the resulting monofunctional polymer chains can be eliminated by employing RZnX or a mixture of RZnX and R₂Zn. The length (n) of the dual-headed zinc chain is determined by the ratio of diene to ZnEt. Exemplary, non-limiting structures of dual headed compositions using different organozinc compounds are illustrated in FIG. 3.

Catalyst or Catalyst Precursor

Suitable catalysts for use herein include any compound or combination of compounds that is adapted for preparing polymers of the desired composition or type and capable of reversible chain transfer with a chain shuttling agent. Both heterogeneous and homogeneous catalysts may be employed. Examples of heterogeneous catalysts include the well known Ziegler-Natta compositions, especially Group 4 metal halides supported on Group 2 metal halides or mixed halides and alkoxides and the well known chromium or vanadium based catalysts. Preferably, the catalysts for use herein are homogeneous catalysts comprising a relatively pure organometallic compound or metal complex, especially compounds or complexes based on metals selected from Groups 3-10 or the Lanthanide series of the Periodic Table of the Elements.

Metal complexes for use herein may be selected from Groups 3 to 15 of the Periodic Table of the Elements containing one or more delocalized, π-bonded ligands or polyvalent Lewis base ligands. Examples include metallocene, half-metallocene, constrained geometry, and polyvalent pyridylamine, or other polychelating base complexes. The complexes are generically depicted by the formula: MK_(k)X_(x)Z_(z), or a dimer thereof, wherein

M is a metal selected from Groups 3-15, preferably 3-10, more preferably 4-8, and most preferably Group 4 of the Periodic Table of the Elements;

K independently in each occurrence is a group containing delocalized π-electrons or one or more electron pairs through which K is bound to M, said K group containing up to 50 atoms not counting hydrogen atoms, optionally two or more K groups may be joined together forming a bridged structure, and further optionally one or more K groups may be bound to Z, to X or to both Z and X;

X independently in each occurrence is a monovalent, anionic moiety having up to 40 non-hydrogen atoms, optionally one or more X groups may be bonded together thereby forming a divalent or polyvalent anionic group, and, further optionally, one or more X groups and one or more Z groups may be bonded together thereby forming a moiety that is both covalently bound to M and coordinated thereto;

Z independently each occurrence is a neutral, Lewis base donor ligand of up to 50 non-hydrogen atoms containing at least one unshared electron pair through which Z is coordinated to M;

k is an integer from 0 to 3; x is an integer from 1 to 4; z is a number from 0 to 3; and

the sum, k+x, is equal to the formal oxidation state of M.

Suitable metal complexes include those containing from 1 to 3 π-bonded anionic or neutral ligand groups, which may be cyclic or non-cyclic delocalized π-bonded anionic ligand groups. Exemplary of such π-bonded groups are conjugated or nonconjugated, cyclic or non-cyclic diene and dienyl groups, allyl groups, boratabenzene groups, phosphole, and arene groups. By the term “π-bonded” is meant that the ligand group is bonded to the transition metal by a sharing of electrons from a partially delocalized π-bond.

Each atom in the delocalized π-bonded group may independently be substituted with a radical selected from the group consisting of hydrogen, halogen, hydrocarbyl, halohydrocarbyl, hydrocarbyl-substituted heteroatoms wherein the heteroatom is selected from Group 14-16 of the Periodic Table of the Elements, and such hydrocarbyl-substituted heteroatom radicals further substituted with a Group 15 or 16 hetero atom containing moiety. In addition two or more such radicals may together form a fused ring system, including partially or fully hydrogenated fused ring systems, or they may form a metallocycle with the metal. Included within the term “hydrocarbyl” are C₁₋₂₀ straight, branched and cyclic alkyl radicals, C₆₋₂o aromatic radicals, C₇₋₂o alkyl-substituted aromatic radicals, and C7-20 aryl-substituted alkyl radicals. Suitable hydrocarbyl-substituted heteroatom radicals include mono-, di- and tri-substituted radicals of boron, silicon, germanium, nitrogen, phosphorus or oxygen wherein each of the hydrocarbyl groups contains from 1 to 20 carbon atoms. Examples include N,N-dimethylamino, pyrrolidinyl, trimethylsilyl, trimethylsilyl, t-butyldimethylsilyl, methyldi(t-butyl)silyl, triphenylgermyl, and trimethylgermyl groups. Examples of Group 15 or 16 hetero atom containing moieties include amino, phosphino, alkoxy, or alkylthio moieties or divalent derivatives thereof, for example, amide, phosphide, alkyleneoxy or alkylenethio groups bonded to the transition metal or Lanthanide metal, and bonded to the hydrocarbyl group, π-bonded group, or hydrocarbyl-substituted heteroatom.

Examples of suitable anionic, delocalized π-bonded groups include cyclopentadienyl, indenyl, fluorenyl, tetrahydroindenyl, tetrahydrofluorenyl, octahydrofluorenyl, pentadienyl, cyclohexadienyl, dihydroanthracenyl, hexahydroanthracenyl, decahydroanthracenyl groups, phosphole, and boratabenzyl groups, as well as inertly substituted derivatives thereof, especially C₁₋₁₀ hydrocarbyl-substituted or tris(C₁₋₁₀ hydrocarbyl)silyl-substituted derivatives thereof. Preferred anionic delocalized π-bonded groups are cyclopentadienyl, pentamethylcyclopentadienyl, tetramethylcyclopentadienyl, tetramethylsilylcyclopentadienyl, indenyl, 2,3-dimethylindenyl, fluorenyl, 2-methylindenyl, 2-methyl-4-phenylindenyl, tetrahydrofluorenyl, octahydrofluorenyl, 1-indacenyl, 3-pyrrolidinoinden-1-yl, 3,4-(cyclopenta(l)phenanthren-1-yl, and tetrahydroindenyl.

The boratabenzenyl ligands are anionic ligands which are boron containing analogues to benzene. They are previously known in the art having been described by G. Herberich, et al., in Organometallics, 14,1, 471-480 (1995). Preferred boratabenzenyl ligands correspond to the formula:

wherein R¹ is an inert substituent, preferably selected from the group consisting of hydrogen, hydrocarbyl, silyl, halo or germyl, said R¹ having up to 20 atoms not counting hydrogen, and optionally two adjacent R¹ groups may be joined together. In complexes involving divalent derivatives of such delocalized π-bonded groups one atom thereof is bonded by means of a covalent bond or a covalently bonded divalent group to another atom of the complex thereby forming a bridged system.

Phospholes are anionic ligands that are phosphorus containing analogues to a cyclopentadienyl group. They are previously known in the art having been described by WO 98/50392, and elsewhere. Preferred phosphole ligands correspond to the formula:

wherein R¹ is as previously defined.

Suitable transition metal complexes for use herein correspond to the formula: MK_(k)X_(x)Z_(z), or a dimer thereof, wherein:

M is a Group 4 metal;

K is a group containing delocalized π-electrons through which K is bound to M, said K group containing up to 50 atoms not counting hydrogen atoms, optionally two K groups may be joined together forming a bridged structure, and further optionally one K may be bound to X or Z;

X each occurrence is a monovalent, anionic moiety having up to 40 non-hydrogen atoms, optionally one or more X and one or more K groups are bonded together to form a metallocycle, and further optionally one or more X and one or more Z groups are bonded together thereby forming a moiety that is both covalently bound to M and coordinated thereto;

Z independently each occurrence is a neutral, Lewis base donor ligand of up to 50 non-hydrogen atoms containing at least one unshared electron pair through which Z is coordinated to M;

-   -   k is an integer from 0 to 3; x is an integer from 1 to 4; z is a         number from 0 to 3; and the sum, k+x, is equal to the formal         oxidation state of M.

Suitable complexes include those containing either one or two K groups. The latter complexes include those containing a bridging group linking the two K groups. Suitable bridging groups are those corresponding to the formula (ER′₂)_(e) wherein E is silicon, germanium, tin, or carbon, R′ independently in each occurrence is hydrogen or a group selected from silyl, hydrocarbyl, hydrocarbyloxy and combinations thereof, said R′ having up to 30 carbon or silicon atoms, and e is 1 to 8. Illustratively, R′ independently in each occurrence is methyl, ethyl, propyl, benzyl, tert-butyl, phenyl, methoxy, ethoxy or phenoxy.

Examples of the complexes containing two K groups are compounds corresponding to the formula:

wherein:

M is titanium, zirconium or hafnium, preferably zirconium or hafnium, in the +2 or +4 formal oxidation state; R³ in each occurrence independently is selected from the group consisting of hydrogen, hydrocarbyl, silyl, germyl, cyano, halo and combinations thereof, said R³ having up to 20 non-hydrogen atoms, or adjacent R³ groups together form a divalent derivative (that is, a hydrocarbadiyl, siladiyl or germadiyl group) thereby forming a fused ring system, and

X″ independently each occurrence is an anionic ligand group of up to 40 non-hydrogen atoms, or two X″ groups together form a divalent anionic ligand group of up to 40 non-hydrogen atoms or together are a conjugated diene having from 4 to 30 non-hydrogen atoms bound by means of delocalized π-electrons to M, whereupon M is in the +2 formal oxidation state, and

R′, E and e are as previously defined.

Exemplary bridged ligands containing two π-bonded groups are: dimethylbis(cyclopentadienyl)silane, dimethylbis(tetramethylcyclopentadienyl)silane, dimethylbis(2-ethylcyclopentadien-1-yl)silane, dimethylbis(2-t-butylcyclopentadien-1-yl)silane, 2,2-bis(tetramethylcyclopentadienyl)propane, dimethylbis(inden-1-yl)silane, dimethylbis(tetrahydroinden-1-yl)silane, dimethylbis(fluoren-1-yl)silane, dimethylbis(tetrahydrofluoren-1-yl)silane, dimethylbis(2-methyl-4-phenylinden-1-yl)-silane, dimethylbis(2-methylinden-1-yl)silane, dimethyl(cyclopentadienyl)(fluoren-1-yl)silane, dimethyl(cyclopentadienyl)(octahydrofluoren-1-yl)silane, dimethyl(cyclopentadienyl)(tetrahydrofluoren-1-yl)silane, (1,1,2,2-tetramethy)-1,2-bis(cyclopentadienyl)disilane, (1,2-bis(cyclopentadienyl)ethane, and dimethyl(cyclopentadienyl)-1-(fluoren-1-yl)methane.

Suitable X″ groups are selected from hydride, hydrocarbyl, silyl, germyl, halohydrocarbyl, halosilyl, silylhydrocarbyl and aminohydrocarbyl groups, or two X″ groups together form a divalent derivative of a conjugated diene or else together they form a neutral, π-bonded, conjugated diene. Exemplary X″ groups are C1-20 hydrocarbyl groups.

Examples of metal complexes of the foregoing formula suitable for use in the present invention include:

-   bis(cyclopentadienyl)zirconiumdimethyl, -   bis(cyclopentadienyl)zirconium dibenzyl, -   bis(cyclopentadienyl)zirconium methyl benzyl, -   bis(cyclopentadienyl)zirconium methyl phenyl, -   bis(cyclopentadienyl)zirconiumdiphenyl, -   bis(cyclopentadienyl)titanium-allyl, -   bis(cyclopentadienyl)zirconiummethylmethoxide, -   bis(cyclopentadienyl)zirconiummethylchloride, -   bis(pentamethylcyclopentadienyl)zirconiumdimethyl, -   bis(pentamethylcyclopentadienyl)titaniumdimethyl, -   bis(indenyl)zirconiumdimethyl, -   indenylfluorenylzirconiumdimethyl, -   bis(indenyl)zirconiummethyl(2-(dimethylamino)benzyl), -   bis(indenyl)zirconiummethyltrimethylsilyl, -   bis(tetrahydroindenyl)zirconiummethyltrimethylsilyl, -   bis(pentamethylcyclopentadienyl)zirconiummethylbenzyl, -   bis(pentamethylcyclopentadienyl)zirconiumdibenzyl, -   bis(pentamethylcyclopentadienyl)zirconiummethylmethoxide, -   bis(pentamethylcyclopentadienyl)zirconiummethylchloride, -   bis(methylethylcyclopentadienyl)zirconiumdimethyl, -   bis(butylcyclopentadienyl)zirconiumdibenzyl, -   bis(t-butylcyclopentadienyl)zirconiumdimethyl, -   bis(ethyltetramethylcyclopentadienyl)zirconiumdimethyl, -   bis(methylpropylcyclopentadienyl)zirconiumdibenzyl, -   bis(trimethylsilylcyclopentadienyl)zirconiumdibenzyl, -   dimethylsilylbis(cyclopentadienyl)zirconiumdichloride, -   dimethylsilylbis(cyclopentadienyl)zirconiumdimethyl, -   dimethylsilylbis(tetramethylcyclopentadienyl)titanium (III) allyl     dimethylsilylbis(t-butylcyclopentadienyl)zirconiumdichloride, -   dimethylsilylbis(n-butylcyclopentadienyl)zirconiumdichloride, -   (dimethylsilylbis(tetramethylcyclopentadienyl)titanium(III)     2-(dimethylamino)benzyl, -   (dimethylsilylbis(n-butylcyclopentadienyl)titanium(III)     2-(dimethylamino)benzyl,     dimethylsilylbis(indenyl)zirconiumdichloride, -   dimethylsilylbis(indenyl)zirconiumdimethyl, -   dimethylsilylbis(2-methylindenyl)zirconiumdimethyl, -   dimethylsilylbis(2-methyl-4-phenylindenyl)zirconiumdimethyl, -   dimethylsilylbis(2-methylindenyl)zirconium-1,4-diphenyl-1,3-butadiene, -   dimethylsilylbis(2-methyl-4-phenylindenyl)zirconium (II)     1,4-diphenyl-1,3-butadiene,     dimethylsilylbis(4,5,6,7-tetrahydroinden-1-yl)zirconiumdichloride, -   dimethylsilylbis(4,5,6,7-tetrahydroinden-1-yl)zirconiumdimethyl, -   dimethylsilylbis(tetrahydroindenyl)zirconium(II)     1,4-diphenyl-1,3-butadiene, -   dimethylsilylbis(tetramethylcyclopentadienyl)zirconium dimethyl, -   dimethylsilylbis(fluorenyl)zirconiumdimethyl, -   dimethylsilylbis(tetrahydrofluorenyl)zirconium bis(trimethylsilyl), -   ethylenebis(indenyl)zirconiumdichloride, -   ethylenebis(indenyl)zirconiumdimethyl, -   ethylenebis(4,5,6,7-tetrahydroindenyl)zirconiumdichloride, -   ethylenebis(4,5,6,7-tetrahydroindenyl)zirconiumdimethyl, -   (isopropylidene)(cyclopentadienyl)(fluorenyl)zirconiumdibenzyl, and -   dimethylsilyl(tetramethylcyclopentadienyl)(fluorenyl)zirconium     dimethyl.

A further class of metal complexes utilized in the present invention corresponds to the preceding formula: MKZ_(z)X_(x), or a dimer thereof, wherein M, K, X, x and z are as previously defined, and Z is a substituent of up to 50 non-hydrogen atoms that together with K forms a metallocycle with M.

Suitable Z substituents include groups containing up to 30 non-hydrogen atoms comprising at least one atom that is oxygen, sulfur, boron or a member of Group 14 of the Periodic Table of the Elements directly attached to K, and a different atom, selected from the group consisting of nitrogen, phosphorus, oxygen or sulfur that is covalently bonded to M.

More specifically this class of Group 4 metal complexes used according to the present invention includes “constrained geometry catalysts” corresponding to the formula:

wherein: M is titanium or zirconium, preferably titanium in the +2, +3, or +4 formal oxidation state;

K¹ is a delocalized, π-bonded ligand group optionally substituted with from 1 to 5 R² groups,

R² in each occurrence independently is selected from the group consisting of hydrogen, hydrocarbyl, silyl, germyl, cyano, halo and combinations thereof, said R² having up to 20 non-hydrogen atoms, or adjacent R² groups together form a divalent derivative (that is, a hydrocarbadiyl, siladiyl or germadiyl group) thereby forming a fused ring system,

each X is a halo, hydrocarbyl, hydrocarbyloxy or silyl group, said group having up to 20 non-hydrogen atoms, or two X groups together form a neutral C5-30 conjugated diene or a divalent derivative thereof;

x is 1 or 2;

Y is —O—, —S—, —NR′—, —PR′—;

and X′ is SiR′₂, CR′₂, SiR′₂SiR′₂, CR′₂CR′₂, CR′═CR′, CR′₂SiR′₂, or GeR′₂, wherein

R′ independently each occurrence is hydrogen or a group selected from silyl, hydrocarbyl, hydrocarbyloxy and combinations thereof, said R′ having up to 30 carbon or silicon atoms.

Specific examples of the foregoing constrained geometry metal complexes include compounds corresponding to the formula:

wherein,

Ar is an aryl group of from 6 to 30 atoms not counting hydrogen;

R⁴ independently each occurrence is hydrogen, Ar, or a group other than Ar selected from hydrocarbyl, trihydrocarbylsilyl, trihydrocarbylgermyl, halide, hydrocarbyloxy, trihydrocarbylsiloxy, bis(trihydrocarbylsilyl)amino, di(hydrocarbyl)amino, hydrocarbadiylamino, hydrocarbylimino, di(hydrocarbyl)phosphino, hydrocarbadiylphosphino, hydrocarbylsulfido, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, trihydrocarbylsilyl-substituted hydrocarbyl, trihydrocarbylsiloxy-substituted hydrocarbyl, bis(trihydrocarbylsilyl)amino-substituted hydrocarbyl, di(hydrocarbyl)amino-substituted hydrocarbyl, hydrocarbyleneamino-substituted hydrocarbyl, di(hydrocarbyl)phosphino-substituted hydrocarbyl, hydrocarbylenephosphino-substituted hydrocarbyl, or hydrocarbylsulfido-substituted hydrocarbyl, said R group having up to 40 atoms not counting hydrogen atoms, and optionally two adjacent R⁴ groups may be joined together forming a polycyclic fused ring group;

M is titanium;

X′ is SiR⁶ ₂, CR⁶ ₂, SiR⁶ ₂SiR⁶ ₂, CR⁶ ₂CR⁶ ₂, CR⁶═CR⁶, CR⁶ 2SiR⁶ ₂, BR⁶, BR⁶L″, or GeR⁶ ₂;

Y is —O—, —S—, —NR⁵—, —PR⁵—; —NR⁵ ₂, or —PR⁵ ₂;

R⁵, independently in each occurrence is hydrocarbyl, trihydrocarbylsilyl, or trihydrocarbylsilylhydrocarbyl, said R⁵ having up to 20 atoms other than hydrogen, and optionally two R⁵ groups or R⁵ together with Y or Z form a ring system;

R⁶, independently in each occurrence, is hydrogen, or a member selected from hydrocarbyl, hydrocarbyloxy, silyl, halogenated alkyl, halogenated aryl, —NR⁵ ₂, and combinations thereof, said R⁶ having up to 20 non-hydrogen atoms, and optionally, two R⁶ groups or R⁶ together with Z forms a ring system;

Z is a neutral diene or a monodentate or polydentate Lewis base optionally bonded to R⁵, R⁶, or X;

X is hydrogen, a monovalent anionic ligand group having up to 60 atoms not counting hydrogen, or two X groups are joined together thereby forming a divalent ligand group;

-   -   x is 1 or 2; and     -   z is 0, 1 or 2.

Suitable examples of the foregoing metal complexes are substituted at both the 3- and 4-positions of a cyclopentadienyl or indenyl group with an Ar group. Examples of the foregoing metal complexes include:

-   (3-phenylcyclopentadien-1-yl)dimethyl(t-butylamido) silanetitanium     dichloride, -   (3-phenylcyclopentadien-1-yl)dimethyl(t-butylamido) silanetitanium     dimethyl, -   (3-phenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,3-diphenyl-1,3-butadiene; -   (3-(pyrrol-1-yl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-(pyrrol-1-yl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-(pyrrol-1-yl)cyclopentadien-1-yl))dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3-(1-methylpyrrol-3-yl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-(1-methylpyrrol-3-yl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-(1-methylpyrrol-3-yl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3,4-diphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3,4-diphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3,4-diphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,3-pentadiene; -   (3-(3-N,N-dimethylamino)phenyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-(3-N,N-dimethylamino)phenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-(3-N,N-dimethylamino)phenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3-(4-methoxyphenyl)-4-methylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-(4-methoxyphenyl)-4-phenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-4-methoxyphenyl)-4-phenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3-phenyl-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-phenyl-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-phenyl-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   2-methyl-(3,4-di(4-methylphenyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   2-methyl-(3,4-di(4-methylphenyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   2-methyl-(3,4-di(4-methylphenyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   ((2,3-diphenyl)-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silane     titanium dichloride, -   ((2,3-diphenyl)-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silane     titanium dimethyl, -   ((2,3-diphenyl)-4-(N,N-dimethylamino)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (2,3,4-triphenyl-5-methylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (2,3,4-triphenyl-5-methylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (2,3,4-triphenyl-5-methylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (3-phenyl-4-methoxycyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (2,3-diphenyl-4-(n-butyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (2,3-diphenyl-4-(n-butyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, -   (2,3-diphenyl-4-(n-butyl)cyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene; -   (2,3,4,5-tetraphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dichloride, -   (2,3,4,5-tetraphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium     dimethyl, and     (2,3,4,5-tetraphenylcyclopentadien-1-yl)dimethyl(t-butylamido)silanetitanium (II)     1,4-diphenyl-1,3-butadiene.

Additional examples of suitable metal complexes herein are polycyclic complexes corresponding to the formula:

where M is titanium in the +2, +3 or +4 formal oxidation state;

R⁷ independently in each occurrence is hydride, hydrocarbyl, silyl, germyl, halide, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, di(hydrocarbyl)amino, hydrocarbyleneamino, di(hydrocarbyl)phosphino, hydrocarbylene-phosphino, hydrocarbylsulfido, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, silyl-substituted hydrocarbyl, hydrocarbylsiloxy-substituted hydrocarbyl, hydrocarbylsilylamino-substituted hydrocarbyl, di(hydrocarbyl)amino-substituted hydrocarbyl, hydrocarbyleneamino-substituted hydrocarbyl, di(hydrocarbyl)phosphino-substituted hydrocarbyl, hydrocarbylene-phosphino-substituted hydrocarbyl, or hydrocarbylsulfido-substituted hydrocarbyl, said R⁷ group having up to 40 atoms not counting hydrogen, and optionally two or more of the foregoing groups may together form a divalent derivative;

R⁸ is a divalent hydrocarbylene- or substituted hydrocarbylene group forming a fused system with the remainder of the metal complex, said R⁸ containing from 1 to 30 atoms not counting hydrogen;

X^(a) is a divalent moiety, or a moiety comprising one σ-bond and a neutral two electron pair able to form a coordinate-covalent bond to M, said X^(a) comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and also comprising nitrogen, phosphorus, sulfur or oxygen;

X is a monovalent anionic ligand group having up to 60 atoms exclusive of the class of ligands that are cyclic, delocalized, it-bound ligand groups and optionally two X groups together form a divalent ligand group;

Z independently in each occurrence is a neutral ligating compound having up to 20 atoms;

x is 0, 1 or 2; and

z is zero or 1.

Suitable examples of such complexes are 3-phenyl-substituted s-indecenyl complexes corresponding to the formula:

2,3-dimethyl-substituted s-indecenyl complexes corresponding to the formulas:

or 2-methyl-substituted s-indecenyl complexes corresponding to the formula:

Additional examples of metal complexes that are usefully employed as catalysts according to the present invention include those of the formula:

Specific metal complexes include:

-   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,4-diphenyl-1,3-butadiene, -   (8-methylene-1,8-dihydrodibenzo[e,     h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide titanium (II)     1,3-pentadiene, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (III) 2-(N,N-dimethylamino)benzyl, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dichloride, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dimethyl, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dibenzyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,4-diphenyl-1,3-butadiene, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,3-pentadiene, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (III) 2-(N,N-dimethylamino)benzyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dichloride, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dimethyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-1-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dibenzyl, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,4-diphenyl-1,3-butadiene, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,3-pentadiene, -   (8-methylene-1,8-dihydrodibenzo[e,h]     azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide titanium (III)     2-(N,N-dimethylamino)benzyl, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dichloride, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dimethyl, -   (8-methylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dibenzyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,4-diphenyl-1,3-butadiene, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (II) 1,3-pentadiene, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (III) 2-(N,N-dimethylamino)benzyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dichloride, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dimethyl, -   (8-difluoromethylene-1,8-dihydrodibenzo[e,h]azulen-2-yl)-N-(1,1-dimethylethyl)dimethylsilanamide     titanium (IV) dibenzyl, and mixtures thereof, especially mixtures of     positional isomers.

Further illustrative examples of metal complexes for use according to the present invention correspond to the formula:

where M is titanium in the +2, +3 or +4 formal oxidation state;

T is —NR⁹— or —O—;

R⁹ is hydrocarbyl, silyl, germyl, dihydrocarbylboryl, or halohydrocarbyl or up to 10 atoms not counting hydrogen;

R¹⁰ independently in each occurrence is hydrogen, hydrocarbyl, trihydrocarbylsilyl, trihydrocarbylsilylhydrocarbyl, germyl, halide, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, di(hydrocarbyl)amino, hydrocarbyleneamino, di(hydrocarbyl)phosphino, hydrocarbylene-phosphino, hydrocarbylsulfido, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, silyl-substituted hydrocarbyl, hydrocarbylsiloxy-substituted hydrocarbyl, hydrocarbylsilylamino-substituted hydrocarbyl, di(hydrocarbyl)amino-substituted hydrocarbyl, hydrocarbyleneamino-substituted hydrocarbyl, di(hydrocarbyl)phosphino-substituted hydrocarbyl, hydrocarbylenephosphino-substituted hydrocarbyl, or hydrocarbylsulfido-substituted hydrocarbyl, said R¹⁰ group having up to 40 atoms not counting hydrogen atoms, and optionally two or more of the foregoing adjacent R¹⁰ groups may together form a divalent derivative thereby forming a saturated or unsaturated fused ring;

X^(a) is a divalent moiety lacking in delocalized it-electrons, or such a moiety comprising one σ-bond and a neutral two electron pair able to form a coordinate-covalent bond to M, said X′ comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and also comprising nitrogen, phosphorus, sulfur or oxygen;

X is a monovalent anionic ligand group having up to 60 atoms exclusive of the class of ligands that are cyclic ligand groups bound to M through delocalized π-electrons or two X groups together are a divalent anionic ligand group;

Z independently in each occurrence is a neutral ligating compound having up to 20 atoms;

x is 0, 1, 2, or 3;

and z is 0 or 1.

Illustratively, T is ═N(CH₃), X is halo or hydrocarbyl, x is 2, X′ is dimethylsilane, z is 0, and R¹⁰ in each occurrence is hydrogen, a hydrocarbyl, hydrocarbyloxy, dihydrocarbylamino, hydrocarbyleneamino, dihydrocarbylamino-substituted hydrocarbyl group, or hydrocarbyleneamino-substituted hydrocarbyl group of up to 20 atoms not counting hydrogen, and optionally two R¹⁰ groups may be joined together.

Illustrative metal complexes of the foregoing formula that may be employed in the practice of the present invention further include the following compounds:

-   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanmm (II)     1,3-pentadiene, -   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (III)     2-(N,N-dimethylamino)benzyl, -   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dichloride, -   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dimethyl, -   (t-butylamido)dimethyl-[6J]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dibenzyl, -   (t-butylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     bis(trimethylsilyl), -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,3-pentadiene, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (III)     2-(N,N-dimethylamino)benzyl, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dichloride, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dimethyl, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dibenzyl, -   (cyclohexylamido)dimethyl-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     bis(trimethylsilyl), -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,3-pentadiene, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (III)     2-(N,N-dimethylamino)benzyl, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dichloride, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dimethyl, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dibenzyl, -   (t-butylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     bis(trimethylsilyl), -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (II)     1,3-pentadiene, -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (III)     2-(N,N-dimethylamino)benzyl, -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dichloride, -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dimethyl, -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     dibenzyl; and -   (cyclohexylamido)di(p-methylphenyl)-[6,7]benzo-[4,5:2′,3′](1-methylisoindol)-(3H)-indene-2-yl)silanetitanium (IV)     bis(trimethylsilyl).

Illustrative Group 4 metal complexes that may be employed in the practice of the present invention further include:

-   (tert-butylamido)(1,1-dimethyl-2,3,4,9,10-η-1,4,5,6,7,8-hexahydronaphthalenyl)dimethylsilanetitaniumdimethyl -   (tert-butylamido)(1,1,2,3-tetramethyl-2,3,4,9,10-η-1,4,5,6,7,8-hexahydronaphthalenyl)dimethylsilanetitaniumdimethyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)     dimethylsilanetitanium dibenzyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium     dimethyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)-1,2-ethanediyltitanium     dimethyl, -   (tert-butylamido)(tetramethyl-η⁵-indenyl)dimethylsilanetitanium     dimethyl, -   (tert-butylamido)(tetramehyl-η⁵-cyclopentadienyl)dimethylsilane     titanium (III) 2-(dimethylamino)benzyl; -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (III)     allyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (III)     2,4-dimethylpentadienyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (II)     1,3-pentadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (II)     2,4-hexadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (IV)     2,3-dimethyl-1,3-butadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (IV)     isoprene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (IV)     1,3-butadiene, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (IV)     2,3-dimethyl-1,3-butadiene, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (IV)     isoprene, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (IV)     dimethyl, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (IV)     dibenzyl, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (IV)     1,3-butadiene, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (II)     1,3-pentadiene, -   (tert-butylamido)(2,3-dimethylindenyl)dimethylsilanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (II)     1,3-pentadiene, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (IV)     dimethyl, -   (tert-butylamido)(2-methylindenyl)dimethylsilanetitanium (IV)     dibenzyl, -   (tert-butylamido)(2-methyl-4-phenylindenyl)dimethylsilanetitanium (II)     1,4-diphenyl-1,3-butadiene, -   (tert-butylamido)(2-methyl-4-phenylindenyl)dimethylsilanetitanium (II)     1,3-pentadiene, -   (tert-butylamido)(2-methyl-4-phenylindenyl)dimethylsilanetitanium (II)     2,4-hexadiene, -   (tert-butylamido)(tetramehyl-η⁵-cyclopentadienyl)dimethyl-silanetitanium (IV)     1,3-butadiene, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium     (IV) -   2,3-dimethyl-1,3-butadiene, -   (tert-butylamido)(tetramehyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (IV)     isoprene, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethyl-silanetitanium (II)     1,4-dibenzyl-1,3-butadiene, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethylsilanetitanium (II)     2,4-hexadiene, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl)dimethyl-silanetitanium (II)     3-methyl-1,3-pentadiene, -   (tert-butylamido)(2,4-dimethylpentadien-3-yl)dimethylsilanetitaniumdimethyl, -   (tert-butylamido)(6,6-dimethylcyclohexadienyl)dimethylsilanetitaniumdimethyl, -   (tert-butylamido)(1,1-dimethyl-2,3,4,9,10-η-1,4,5,6,7,8-hexahydronaphthalen-4-yl)dimethylsilanetitaniumdimethyl, -   (tert-butylamido)(1,1,2,3-tetramethyl-2,3,4,9,10-η-1,4,5,6,7,8-hexahydronaphthalen-4-yl)dimethylsilanetitaniumdimethyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl     methylphenylsilanetitanium (IV) dimethyl, -   (tert-butylamido)(tetramethyl-η⁵-cyclopentadienyl     methylphenylsilanetitanium (II) 1,4-diphenyl-1,3-butadiene, -   1-(tert-butylamido)-2-(tetramethyl-η⁵-cyclopentadienyl)ethanediyltitanium (IV)     dimethyl, and -   1-(tert-butylamido)-2-(tetramethyl-η⁵-cyclopentadienyl)ethanediyl-titanium (II)     1,4-diphenyl-1,3-butadiene.

Other delocalized, 27-bonded complexes, especially those containing other Group 4 metals, will, of course, be apparent to those skilled in the art, and are disclosed among other places in: WO 03/78480, WO 03/78483, WO 02/92610, WO 02/02577, US 2003/0004286 and U.S. Pat. Nos. 6,515,155, 6,555,634, 6,150,297, 6,034,022, 6,268,444, 6,015,868, 5,866,704, and 5,470,993.

Additional examples of metal complexes that are usefully employed as catalysts are complexes of polyvalent Lewis bases, such as compounds corresponding to the formula:

wherein T^(b) is a bridging group, preferably containing 2 or more atoms other than hydrogen,

X^(b) and Y^(b) are each independently selected from the group consisting of nitrogen, sulfur, oxygen and phosphorus; more preferably both X^(b) and Y^(b) are nitrogen,

R^(b) and R^(b)′ independently in each occurrence are hydrogen or C1-50 hydrocarbyl groups optionally containing one or more heteroatoms or inertly substituted derivative thereof. Non-limiting examples of suitable R^(b) and R^(b)′ groups include alkyl, alkenyl, aryl, aralkyl, (poly)alkylaryl and cycloalkyl groups, as well as nitrogen, phosphorus, oxygen and halogen substituted derivatives thereof. Specific examples of suitable Rb and Rb′ groups include methyl, ethyl, isopropyl, octyl, phenyl, 2,6-dimethylphenyl, 2,6-di(isopropyl)phenyl, 2,4,6-trimethylphenyl, pentafluorophenyl, 3,5-trifluoromethylphenyl, and benzyl;

g is 0 or 1;

M^(b) is a metallic element selected from Groups 3 to 15, or the Lanthanide series of the Periodic Table of the Elements. Preferably, M^(b) is a Group 3-13 metal, more preferably M^(b) is a Group 4-10 metal;

L^(b) is a monovalent, divalent, or trivalent anionic ligand containing from 1 to 50 atoms, not counting hydrogen. Examples of suitable L^(b) groups include halide; hydride; hydrocarbyl, hydrocarbyloxy; di(hydrocarbyl)amido, hydrocarbyleneamido, di(hydrocarbyl)phosphido; hydrocarbylsulfido; hydrocarbyloxy, tri(hydrocarbylsilyl)alkyl; and carboxylates. More preferred L^(b) groups are C1-20 alkyl, C₇₋₂₀ aralkyl, and chloride;

h is an integer from 1 to 6, preferably from 1 to 4, more preferably from 1 to 3, and j is 1 or 2, with the value h×j selected to provide charge balance;

Z^(b) is a neutral ligand group coordinated to M^(b), and containing up to 50 atoms not counting hydrogen. Preferred Z^(b) groups include aliphatic and aromatic amines, phosphines, and ethers, alkenes, alkadienes, and inertly substituted derivatives thereof. Suitable inert substituents include halogen, alkoxy, aryloxy, alkoxycarbonyl, aryloxycarbonyl, di(hydrocarbyl)amine, tri(hydrocarbyl)silyl, and nitrile groups. Preferred Z^(b) groups include triphenylphosphine, tetrahydrofuran, pyridine, and 1,4-diphenylbutadiene;

-   -   f is an integer from 1 to 3;

two or three of T^(b), R^(b) and R^(b)′ may be joined together to form a single or multiple ring structure;

h is an integer from 1 to 6, preferably from 1 to 4, more preferably from 1 to 3;

indicates any form of electronic interaction, especially coordinate or covalent bonds, including multiple bonds, arrows signify coordinate bonds, and dotted lines indicate optional double bonds.

In one embodiment, it is preferred that R^(b) have relatively low steric hindrance with respect to X^(b). In this embodiment, most preferred R^(b) groups are straight chain alkyl groups, straight chain alkenyl groups, branched chain alkyl groups wherein the closest branching point is at least 3 atoms removed from X^(b), and halo, dihydrocarbylamino, alkoxy or trihydrocarbylsilyl substituted derivatives thereof. Highly preferred R^(b) groups in this embodiment are C1-8 straight chain alkyl groups.

At the same time, in this embodiment R^(b)′ preferably has relatively high steric hindrance with respect to Y^(b). Non-limiting examples of suitable R^(b)′ groups for this embodiment include alkyl or alkenyl groups containing one or more secondary or tertiary carbon centers, cycloalkyl, aryl, alkaryl, aliphatic or aromatic heterocyclic groups, organic or inorganic oligomeric, polymeric or cyclic groups, and halo, dihydrocarbylamino, alkoxy or trihydrocarbylsilyl substituted derivatives thereof. Preferred R^(b)′ groups in this embodiment contain from 3 to 40, more preferably from 3 to 30, and most preferably from 4 to 20 atoms not counting hydrogen and are branched or cyclic.

Examples of preferred T^(b) groups are structures corresponding to the following formulas:

wherein

Each R^(d) is C1-10 hydrocarbyl group, preferably methyl, ethyl, n-propyl, i-propyl, t-butyl, phenyl, 2,6-dimethylphenyl, benzyl, or tolyl. Each R^(e) is C1-10 hydrocarbyl, preferably methyl, ethyl, n-propyl, i-propyl, t-butyl, phenyl, 2,6-dimethylphenyl, benzyl, or tolyl. In addition, two or more R^(d) or R^(e) groups, or mixtures of Rd and Re groups may together form a polyvalent derivative of a hydrocarbyl group, such as, 1,4-butylene, 1,5-pentylene, or a multicyclic, fused ring, polyvalent hydrocarbyl- or heterohydrocarbyl-group, such as naphthalene-1,8-diyl.

Suitable examples of the foregoing polyvalent Lewis base complexes include:

wherein R^(d′) each occurrence is independently selected from the group consisting of hydrogen and C1-50 hydrocarbyl groups optionally containing one or more heteroatoms, or inertly substituted derivative thereof, or further optionally, two adjacent R^(d′) groups may together form a divalent bridging group;

d′ is 4;

M^(b′) is a Group 4 metal, preferably titanium or hafnium, or a Group 10 metal, preferably Ni or Pd;

L^(b′) is a monovalent ligand of up to 50 atoms not counting hydrogen, preferably halide or hydrocarbyl, or two L^(b′) groups together are a divalent or neutral ligand group, preferably a C₂₋₅₀ hydrocarbylene, hydrocarbadiyl or diene group.

The polyvalent Lewis base complexes for use in the present invention especially include Group 4 metal derivatives, especially hafnium derivatives of hydrocarbylamine substituted heteroaryl compounds corresponding to the formula:

wherein:

R¹¹ is selected from alkyl, cycloalkyl, heteroalkyl, cycloheteroalkyl, aryl, and inertly substituted derivatives thereof containing from 1 to 30 atoms not counting hydrogen or a divalent derivative thereof;

T¹ is a divalent bridging group of from 1 to 41 atoms other than hydrogen, preferably 1 to 20 atoms other than hydrogen, and most preferably a mono- or di-C1-20 hydrocarbyl substituted methylene or silane group; and

R¹² is a C₅₋₂₀ heteroaryl group containing Lewis base functionality, especially a pyridin-2-yl- or substituted pyridin-2-yl group or a divalent derivative thereof;

M¹ is a Group 4 metal, preferably hafnium;

X¹ is an anionic, neutral or dianionic ligand group;

-   -   x′ is a number from 0 to 5 indicating the number of such X¹         groups; and bonds, optional bonds and electron donative         interactions are represented by lines, dotted lines and arrows         respectively.

Suitable complexes are those wherein ligand formation results from hydrogen elimination from the amine group and optionally from the loss of one or more additional groups, especially from R¹². In addition, electron donation from the Lewis base functionality, preferably an electron pair, provides additional stability to the metal center. Suitable metal complexes correspond to the formula:

wherein M¹, X¹, x′, R¹¹ and T¹ are as previously defined,

R¹³, R¹⁴, R¹⁵ and R¹⁶ are hydrogen, halo, or an alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aryl, or silyl group of up to 20 atoms not counting hydrogen, or adjacent R¹³, R¹⁴, R¹⁵ or R¹⁶ groups may be joined together thereby forming fused ring derivatives, and bonds, optional bonds and electron pair donative interactions are represented by lines, dotted lines and arrows respectively. Suitable examples of the foregoing metal complexes correspond to the formula:

wherein

M¹, X¹, and x′ are as previously defined,

R¹³, R¹⁴, R¹⁵ and R¹⁶ are as previously defined, preferably R¹³, R¹⁴, and R¹⁵ are hydrogen, or C1-4 alkyl, and R¹⁶ is C₆₋₂o aryl, most preferably naphthalenyl;

R^(a) independently in each occurrence is C₁₋₄ alkyl, and a is 1-5, most preferably R^(a) in two ortho-positions to the nitrogen is isopropyl or t-butyl;

R¹⁷ and R¹⁸ independently in each occurrence are hydrogen, halogen, or a C₁₋₂₀ alkyl or aryl group, most preferably one of R¹⁷ and R¹⁸ is hydrogen and the other is a C6-20 aryl group, especially 2-isopropyl, phenyl or a fused polycyclic aryl group, most preferably an anthracenyl group, and bonds, optional bonds and electron pair donative interactions are represented by lines, dotted lines and arrows respectively.

Exemplary metal complexes for use herein as catalysts correspond to the formula:

wherein X¹ each occurrence is halide, N,N-dimethylamido, or C₁₋₄ alkyl, and preferably each occurrence X¹ is methyl;

R^(f) independently in each occurrence is hydrogen, halogen, C1-20 alkyl, or C6-20 aryl, or two adjacent R^(f) groups are joined together thereby forming a ring, and f is 1-5; and

R^(c) independently each occurrence is hydrogen, halogen, C₁₋₂₀ alkyl, or C₆₋₂₀ aryl, or two adjacent R^(c) groups are joined together thereby forming a ring, and c is 1-5.

Suitable examples of metal complexes for use as catalysts according to the present invention are complexes of the following formulas:

wherein R^(x) is C1-4 alkyl or cycloalkyl, preferably methyl, isopropyl, t-butyl or cyclohexyl; and

X¹ each occurrence is halide, N,N-dimethylamido, or C1-4 alkyl, preferably methyl.

Examples of metal complexes usefully employed as catalysts according to the present invention include:

-   [N-(2,6-di(1-methylethyl)phenyl)amido)(o-tolyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     dimethyl; -   [N-(2,6-di(1-methylethyl)phenyl)amido)(o-tolyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafhium     di(N,N-dimethylamido); -   [N-(2,6-di(1-methylethyl)phenyl)amido)(o-tolyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     dichloride; -   [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)((α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     dimethyl; -   [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     di(N,N-dimethylamido); -   [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     dichloride; -   [N-(2,6-di(1-methylethyl)phenyl)amido)(phenanthren-5-yl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafhium     dimethyl; -   [N-(2,6-di(1-methylethyl)phenyl)amido)(phenanthren-5-yl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafhium     di(N,N-dimethylamido); and -   [N-(2,6-di(1-methylethyl)phenyl)amido)(phenanthren-5-yl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium     dichloride.

Under the reaction conditions used to prepare the metal complexes used in the present invention, the hydrogen of the 2-position of the α-naphthalene group substituted at the 6-position of the pyridin-2-yl group is subject to elimination, thereby uniquely forming metal complexes wherein the metal is covalently bonded to both the resulting amide group and to the 2-position of the α-naphthalenyl group, as well as stabilized by coordination to the pyridinyl nitrogen atom through the electron pair of the nitrogen atom. Additional suitable metal complexes of polyvalent Lewis bases for use herein include compounds corresponding to the formula:

wherein:

R²⁰ is an aromatic or inertly substituted aromatic group containing from 5 to 20 atoms not counting hydrogen, or a polyvalent derivative thereof;

T³ is a hydrocarbylene or silane group having from 1 to 20 atoms not counting hydrogen, or an inertly substituted derivative thereof;

M³ is a Group 4 metal, preferably zirconium or hafnium;

G is an anionic, neutral or dianionic ligand group; preferably a halide, hydrocarbyl or dihydrocarbylamide group having up to 20 atoms not counting hydrogen;

g is a number from 1 to 5 indicating the number of such G groups; and bonds and electron donative interactions are represented by lines and arrows respectively.

Illustratively, such complexes correspond to the formula:

wherein:

T³ is a divalent bridging group of from 2 to 20 atoms not counting hydrogen, preferably a substituted or unsubstituted, C3-6 alkylene group;

-   -   and Ar² independently in each occurrence is an arylene or an         alkyl- or aryl-substituted arylene group of from 6 to 20 atoms         not counting hydrogen;

M³ is a Group 4 metal, preferably hafnium or zirconium; G independently in each occurrence is an anionic, neutral or dianionic ligand group;

g is a number from 1 to 5 indicating the number of such X groups; and electron donative interactions are represented by arrows.

Suitable examples of metal complexes of foregoing formula include the following compounds

where M³ is Hf or Zr;

Ar⁴ is C₆₋₂₀ aryl or inertly substituted derivatives thereof, especially 3,5-di(isopropyl)phenyl, 3,5-di(isobutyl)phenyl, dibenzo-1H-pyrrole-1-yl, or anthracen-5-yl, and

T⁴ independently in each occurrence comprises a C₃₋₆ alkylene group, a C₃₋₆ cycloalkylene group, or an inertly substituted derivative thereof;

R²¹ independently in each occurrence is hydrogen, halo, hydrocarbyl, trihydrocarbylsilyl, or trihydrocarbylsilylhydrocarbyl of up to 50 atoms not counting hydrogen; and

G, independently in each occurrence is halo or a hydrocarbyl or trihydrocarbylsilyl group of up to 20 atoms not counting hydrogen, or 2 G groups together are a divalent derivative of the foregoing hydrocarbyl or trihydrocarbylsilyl groups.

Suitable compounds are compounds of the formulas:

wherein Ar⁴ is 3,5-di(isopropyl)phenyl, 3,5-di(isobutyl)phenyl, dibenzo-1H-pyrrole-1-yl, or anthracen-5-yl,

R²¹ is hydrogen, halo, or C1-4 alkyl, especially methyl

T⁴ is propan-1,3-diyl or butan-1,4-diyl, and

G is chloro, methyl or benzyl.

An exemplary metal complex of the foregoing formula is:

The foregoing polyvalent Lewis base complexes are conveniently prepared by standard metallation and ligand exchange procedures involving a source of the Group 4 metal and the neutral polyfunctional ligand source. In addition, the complexes may also be prepared by means of an amide elimination and hydrocarbylation process starting from the corresponding Group 4 metal tetraamide and a hydrocarbylating agent, such as trimethylaluminum. Other techniques may be used as well. These complexes are known from the disclosures of, among others, U.S. Pat. Nos. 6,320,005, 6,103,657, WO 02/38628, WO 03/40195, and U.S. Ser. No. 04/022,0050.

Catalysts having high comonomer incorporation properties are also known to reincorporate in situ prepared long chain olefins resulting incidentally during the polymerization through β-hydride elimination and chain termination of growing polymer, or other process. The concentration of such long chain olefins is particularly enhanced by use of continuous solution polymerization conditions at high conversions, especially ethylene conversions of 95 percent or greater, more preferably at ethylene conversions of 97 percent or greater. Under such conditions a small but detectable quantity of olefin terminated polymer may be reincorporated into a growing polymer chain, resulting in the formation of long chain branches, that is, branches of a carbon length greater than would result from other deliberately added comonomer. Moreover, such chains reflect the presence of other comonomers present in the reaction mixture. That is, the chains may include short chain or long chain branching as well, depending on the comonomer composition of the reaction mixture. Long chain branching of olefin polymers is further described in U.S. Pat. Nos. 5,272,236, 5,278,272, and 5,665,800.

Alternatively, branching, including hyper-branching, may be induced in a particular segment of the present multi-block copolymers by the use of specific catalysts known to result in “chain-walking” in the resulting polymer. For example, certain homogeneous bridged bis indenyl- or partially hydrogenated bis indenyl-zirconium catalysts, disclosed by Kaminski, et al., J. Mol. Catal. A: Chemical, 102 (1995) 59-65; Zambelli, et al., Macromolecules, 1988, 21, 617-622; or Dias, et al., J. Mol. Catal. A: Chemical, 185 (2002) 57-64 may be used to prepare branched copolymers from single monomers, including ethylene. Higher transition metal catalysts, especially nickel and palladium catalysts are also known to lead to hyper-branched polymers (the branches of which are also branched) as disclosed in Brookhart, et al., J. Am. Chem. Soc., 1995, 117, 64145-6415.

Additional complexes suitable for use include Group 4-10 derivatives corresponding to the formula:

wherein

M² is a metal of Groups 4-10 of the Periodic Table of the elements, preferably Group 4 metals, Ni(II) or Pd(II), most preferably zirconium;

T² is a nitrogen, oxygen or phosphorus containing group;

X² is halo, hydrocarbyl, or hydrocarbyloxy;

-   -   t is one or two;     -   x″ is a number selected to provide charge balance;     -   and T² and N are linked by a bridging ligand.

Such catalysts have been previously disclosed in J. Am. Chem. Soc., 118, 267-268 (1996), J. Am. Chem. Soc., 117, 6414-6415 (1995), and Organometallics, 16, 1514-1516, (1997), among other disclosures.

Suitable examples of the foregoing metal complexes for use as catalysts are aromatic diimine or aromatic dioxyimine complexes of Group 4 metals, especially zirconium, corresponding to the formula:

wherein;

M², X² and T² are as previously defined;

R^(d) independently in each occurrence is hydrogen, halogen, or R^(e); and

R^(e) independently in each occurrence is C1-20 hydrocarbyl or a heteroatom-, especially a F, N, S or P-substituted derivative thereof, more preferably C1-20 hydrocarbyl or a F or N substituted derivative thereof, most preferably alkyl, dialkylaminoalkyl, pyrrolyl, piperidenyl, perfluorophenyl, cycloalkyl, (poly)alkylaryl, or aralkyl.

Suitable examples of the foregoing metal complexes for use as catalysts are aromatic dioxyimine complexes of zirconium, corresponding to the formula:

wherein;

X² is as previously defined, preferably C1-10 hydrocarbyl, most preferably methyl or benzyl; and

R^(e)′ is methyl, isopropyl, t-butyl, cyclopentyl, cyclohexyl, 2-methylcyclohexyl, 2,4-dimethylcyclohexyl, 2-pyrrolyl, N-methyl-2-pyrrolyl, 2-piperidenyl, N-methyl-2-piperidenyl, benzyl, o-tolyl, 2,6-dimethylphenyl, perfluorophenyl, 2,6-di(isopropyl)phenyl, or 2,4,6-trimethylphenyl.

The foregoing complexes for use as also include certain phosphinimine complexes are disclosed in EP-A-890581. These complexes correspond to the formula: [(R^(f))₃—P═N]_(f)M(K²)(R^(f))_(3-f), wherein: R^(f) is a monovalent ligand or two R^(f) groups together are a divalent ligand, preferably R^(f) is hydrogen or C1-4 alkyl;

M is a Group 4 metal,

K² is a group containing delocalized π-electrons through which K² is bound to M, said K² group containing up to 50 atoms not counting hydrogen atoms, and

f is 1 or 2.

With reference to the above discussion of the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, the catalyst precursor (in combination with the co-catalyst) may remain as an active catalyst in the final solution and can further function as a catalyst in subsequent polymerization. Accordingly, the final solution of the process of the present disclosure (the final solution comprising the catalyst and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹) can be directly used for polymerization without any isolation, purification, or separation requirements and without the requirement of having a removable supported catalyst.

Suitable catalyst precursors for the present disclosure include any catalyst having good chain transfer ability with organometallic compounds. Suitable catalyst precursors should have no detrimental effect on subsequent polymerization and, therefore, need not be removed from the final solution prior to polymerization. Suitable catalyst precursors may be good comonomer incorporating catalysts, can be used to make the compositions having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, and can also continue to remain active (in combination with co-catalyst) as catalysts to make desired polymers in polymerization reactors, as discussed below.

Exemplary catalyst precursors that can be used in accordance with the present disclosure include but are not limited to Catalysts (A1)-(A7), as listed below.

Catalyst (A1): [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium dimethyl] prepared according to the teachings of WO 03/40195 and WO 04/24740 as well as methods known in the art.

Catalyst (A2): (E)-((2,6-diisopropylphenyl)(2-methyl-3-(octylimino)butan-2-yl)amino)trimethyl hafnium prepared according to methods known in the art.

Catalyst (A3): [[2′,2′″-[1,2-cyclohexanediylbis(methyleneoxy-κO)]bis[3-(9H-carbazol-9-yl)-5-methyl[1,1′-biphenyl]-2-olato-κO]](2-)]dimethyl hafnium prepared according to methods known in the art.

Catalyst (A4): [[2′,2″′-[1,4-butanediylbis(oxy-κO)]bis[3-(9H-carbazol-9-yl)-3′-fluoro-5-methyl[1,1′-biphenyl]-2-olato-κO]](2-)]-dimethyl hafnium prepared according to methods known in the art.

Catalyst (A5): Cyclopentadienylbis((trimethylsilyl)methyl)scandium tetrahydrofuran complex prepared according to methods known in the art.

Catalyst (A6): (Mesityl(pyridin-2-ylmethyl)amino)tribenzyl hafnium prepared according to methods known in the art.

Catalyst (A7): (N-((6E)-6-(Butylimino-κN)-1-cyclohexen-1-yl)-2,6-bis(1-methylethyl)benzenaminato-κN)trimethyl-hafnium prepared according to the disclosures of WO2010/022228 as well as methods known in the art.

Co-Catalyst

Each of the catalyst precursors of the present disclosure may be activated to form the active catalyst composition by combination with a co-catalyst, preferably a cation forming co-catalyst, a strong Lewis acid, or a combination thereof. Thus, this disclosure also provides for the use of at least one co-catalyst in a catalyst composition and various methods, along with at least one catalyst precursor, and at least one composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ as disclosed herein.

Suitable cation forming co-catalysts include those previously known in the art for metal olefin polymerization complexes. Examples include neutral Lewis acids, such as C₁₋₃₀ hydrocarbyl substituted Group 13 compounds, especially tri(hydrocarbyl)aluminum- or tri(hydrocarbyl)boron compounds and halogenated (including perhalogenated) derivatives thereof, having from 1 to 10 carbons in each hydrocarbyl or halogenated hydrocarbyl group, more especially perfluorinated tri(aryl)boron compounds, and most especially tris(pentafluoro-phenyl)borane; nonpolymeric, compatible, noncoordinating, ion forming compounds (including the use of such compounds under oxidizing conditions), especially the use of ammonium-, phosphonium-, oxonium-, carbonium-, silylium- or sulfonium-salts of compatible, noncoordinating anions, or ferrocenium-, lead- or silver salts of compatible, noncoordinating anions; and combinations of the foregoing cation forming cocatalysts and techniques. The foregoing activating co-catalysts and activating techniques have been previously taught with respect to different metal complexes for olefin polymerizations in the following references: EP-A-277,003; U.S. Pat. Nos. 5,153,157; 5,064,802; 5,321,106; 5,721,185; 5,350,723; 5,425,872; 5,625,087; 5,883,204; 5,919,983; 5,783,512; WO 99/15534, and WO99/42467.

Combinations of neutral Lewis acids, especially the combination of a trialkyl aluminum compound having from 1 to 4 carbons in each alkyl group and a halogenated tri(hydrocarbyl)boron compound having from 1 to 20 carbons in each hydrocarbyl group, especially tris(pentafluorophenyl)borane, further combinations of such neutral Lewis acid mixtures with a polymeric or oligomeric alumoxane, and combinations of a single neutral Lewis acid, especially tris(pentafluorophenyl)borane with a polymeric or oligomeric alumoxane may be used as activating cocatalysts. Preferred molar ratios of metal complex:tris(pentafluorophenyl-borane:alumoxane are from 1:1:1 to 1:5:20, more preferably from 1:1:1.5 to 1:5:10.

Suitable ion forming compounds useful as co-catalysts in one embodiment of the present disclosure comprise a cation which is a Brönsted acid capable of donating a proton, and a compatible, noncoordinating anion, A⁻. As used herein, the term “noncoordinating” refers to an anion or substance which either does not coordinate to the Group 4 metal containing precursor complex and the catalytic derivative derived there from, or which is only weakly coordinated to such complexes thereby remaining sufficiently labile to be displaced by a neutral Lewis base. A noncoordinating anion specifically refers to an anion which when functioning as a charge balancing anion in a cationic metal complex does not transfer an anionic substituent or fragment thereof to said cation thereby forming neutral complexes. “Compatible anions” are anions which are not degraded to neutrality when the initially formed complex decomposes and are noninterfering with desired subsequent polymerization or other uses of the complex.

Preferred anions are those containing a single coordination complex comprising a charge-bearing metal or metalloid core which anion is capable of balancing the charge of the active catalyst species (the metal cation) which may be formed when the two components are combined. Also, said anion should be sufficiently labile to be displaced by olefinic, diolefinic and acetylenically unsaturated compounds or other neutral Lewis bases such as ethers or nitriles. Suitable metals include, but are not limited to, aluminum, gold and platinum. Suitable metalloids include, but are not limited to, boron, phosphorus, and silicon. Compounds containing anions which comprise coordination complexes containing a single metal or metalloid atom are, of course, well known and many, particularly such compounds containing a single boron atom in the anion portion, are available commercially.

In one aspect, suitable cocatalysts may be represented by the following general formula: (L*-H)AA)_(g) ⁺(A)^(g−),

wherein:

L* is a neutral Lewis base;

(L*-H)⁺ is a conjugate Brønsted acid of L*;

A^(g−) is a noncoordinating, compatible anion having a charge of g−, and g is an integer from 1 to 3.

More particularly, A^(g−) corresponds to the formula: [MiQ₄]⁻; wherein:

Mi is boron or aluminum in the +3 formal oxidation state; and

Q independently in each occurrence is selected from hydride, dialkyl-amido, halide, hydrocarbyl, hydrocarbyloxide, halosubstituted-hydrocarbyl, halosubstituted hydrocarbyloxy, and halo-substituted silylhydrocarbyl radicals (including perhalogenated hydrocarbyl-perhalogenated hydrocarbyloxy- and perhalogenated silylhydrocarbyl radicals), each Q having up to 20 carbons with the proviso that in not more than one occurrence is Q halide. Examples of suitable hydrocarbyloxide Q groups are disclosed in U.S. Pat. No. 5,296,433.

In a more preferred embodiment, d is one, that is, the counter ion has a single negative charge and is A⁻. Activating cocatalysts comprising boron which are particularly useful in the preparation of catalysts of this disclosure may be represented by the following general formula: (L*-H)⁺(BQ₄)⁻;

wherein:

L* is as previously defined;

B is boron in a formal oxidation state of 3; and

Q is a hydrocarbyl-, hydrocarbyloxy-, fluorinated hydrocarbyl-, fluorinated hydrocarbyloxy-, or fluorinated silylhydrocarbyl-group of up to 20 nonhydrogen atoms, with the proviso that in not more than one occasion is Q hydrocarbyl.

Especially useful Lewis base salts are ammonium salts, more preferably trialkyl-ammonium salts containing one or more C₁₂₋₄₀ alkyl groups. In this aspect, for example, Q in each occurrence can be a fluorinated aryl group, especially, a pentafluorophenyl group.

Illustrative, but not limiting, examples of boron compounds which may be used as an activating cocatalyst in the preparation of the improved catalysts of this disclosure include the tri-substituted ammonium salts such as:

-   trimethylammonium tetrakis(pentafluorophenyl)borate, -   triethylammonium tetrakis(pentafluorophenyl)borate, -   tripropylammonium tetrakis(pentafluorophenyl)borate, -   tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, -   tri(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate, -   N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, -   N,N-dimethylanilinium n-butyltris(pentafluorophenyl)borate, -   N,N-dimethylanilinium benzyltris(pentafluorophenyl)borate, -   N,N-dimethylanilinium tetrakis(4-(t-butyldimethylsilyl)-2,3,5,6     tetrafluorophenyl)borate, -   N,N-dimethylanilinium     tetrakis(4-(triisopropylsilyl)-2,3,5,6-tetrafluorophenyl)borate, -   N,N-dimethylanilinium     pentafluorophenoxytris(pentafluorophenyl)borate, -   N,N-diethylanilinium tetrakis(pentafluorophenyl)borate, -   N,N-dimethyl-2,4,6-trimethylanilinium     tetrakis(pentafluorophenyl)borate, -   dimethyloctadecylammonium tetrakis(pentafluorophenyl)borate, -   methyldioctadecylammonium tetrakis(pentafluorophenyl)borate; -   a number of dialkyl ammonium salts such as: -   di-(i-propyl) ammonium tetrakis(pentafluorophenyl)borate, -   methyloctadecylammonium tetrakis(pentafluorophenyl)borate, -   methyloctadodecylammonium tetrakis(pentafluorophenyl)borate, and -   dioctadecylammonium tetrakis(pentafluorophenyl)borate; -   various tri-substituted phosphonium salts such as: -   triphenylphosphonium tetrakis(pentafluorophenyl)borate, -   methyldioctadecylphosphonium tetrakis(pentafluorophenyl)borate, and -   tri(2,6-dimethylphenyl)phosphonium     tetrakis(pentafluorophenyl)borate; -   di-substituted oxonium salts such as: -   diphenyloxonium tetrakis(pentafluorophenyl)borate, -   di(o-tolyl)oxonium tetrakis(pentafluorophenyl)borate, and -   di(octadecyl)oxonium tetrakis(pentafluorophenyl)borate; and -   di-substituted sulfonium salts such as: -   di(o-tolyl)sulfonium tetrakis(pentafluorophenyl)borate, and -   methylcotadecylsulfonium tetrakis(pentafluorophenyl)borate.

Further to this aspect of the disclosure, examples of useful (L*-H)⁺cations include, but are not limited to, methyldioctadecylammonium cations, dimethyloctadecylammonium cations, and ammonium cations derived from mixtures of trialkyl amines containing one or two C₁₄₋₁₈ alkyl groups.

Another suitable ion forming, activating cocatalyst comprises a salt of a cationic oxidizing agent and a noncoordinating, compatible anion represented by the formula: (Ox^(h+))_(g)(A^(g−))_(h),

wherein:

Ox^(h+) is a cationic oxidizing agent having a charge of h+;

h is an integer from 1 to 3; and

A⁻ and g are as previously defined.

Examples of cationic oxidizing agents include: ferrocenium, hydrocarbyl-substituted ferrocenium, Ag⁺, or Pb⁺². Particularly useful examples of A^(g−) are those anions previously defined with respect to the Bronsted acid containing activating cocatalysts, especially tetrakis(pentafluorophenyl)borate.

Another suitable ion forming, activating cocatalyst can be a compound which is a salt of a carbenium ion and a noncoordinating, compatible anion represented by the following formula: [C]⁺A⁻

wherein:

[C]⁺ is a C₁₋₂₀ carbenium ion; and

is a noncoordinating, compatible anion having a charge of −1. For example, one carbenium ion that works well is the trityl cation, that is triphenylmethylium.

A further suitable ion forming, activating cocatalyst comprises a compound which is a salt of a silylium ion and a noncoordinating, compatible anion represented by the formula: (Q¹ ₃Si)⁺A⁻

wherein:

Q¹ is C₁₋₁₀hydrocarbyl, and A⁻ is as previously defined.

Suitable silylium salt activating cocatalysts include trimethylsilylium tetrakispentafluorophenylborate, triethylsilylium tetrakispentafluorophenylborate, and ether substituted adducts thereof. Silylium salts have been previously generically disclosed in J. Chem. Soc. Chem. Comm. 1993, 383-384, as well as in Lambert, J. B., et al., Organometallics 1994, 13, 2430-2443. The use of the above silylium salts as activating cocatalysts for addition polymerization catalysts is also described in U.S. Pat. No. 5,625,087.

Certain complexes of alcohols, mercaptans, silanols, and oximes with tris(pentafluorophenyl)borane are also effective catalyst activators and may be used according to the present disclosure. Such cocatalysts are disclosed in U.S. Pat. No. 5,296,433.

Suitable activating cocatalysts for use herein also include polymeric or oligomeric alumoxanes (also called aluminoxanes), especially methylalumoxane (MAO), triisobutyl aluminum modified methylalumoxane (MMAO), or isobutylalumoxane; Lewis acid modified alumoxanes, especially perhalogenated tri(hydrocarbyl)aluminum- or perhalogenated tri(hydrocarbyl)boron modified alumoxanes, having from 1 to 10 carbons in each hydrocarbyl or halogenated hydrocarbyl group, and most especially tris(pentafluorophenyl)borane modified alumoxanes. Such co-catalysts are previously disclosed in U.S. Pat. Nos. 6,214,760, 6,160,146, 6,140,521, and 6,696,379.

A class of co-catalysts comprising non-coordinating anions generically referred to as expanded anions, further disclosed in U.S. Pat. No. 6,395,671, may be suitably employed to activate the metal complexes of the present disclosure for olefin polymerization. Generally, these co-catalysts (illustrated by those having imidazolide, substituted imidazolide, imidazolinide, substituted imidazolinide, benzimidazolide, or substituted benzimidazolide anions) may be depicted as follows:

wherein:

A*⁺ is a cation, especially a proton containing cation, and can be trihydrocarbyl ammonium cation containing one or two C₁₀₋₄₀ alkyl groups, especially a methyldi(C₁₄₋₂₀ alkyl)ammonium cation,

Q³, independently in each occurrence, is hydrogen or a halo, hydrocarbyl, halocarbyl, halohydrocarbyl, silylhydrocarbyl, or silyl, (including for example mono-, di- and tri(hydrocarbyl)silyl) group of up to 30 atoms not counting hydrogen, such as C₁₋₂₀ alkyl, and

Q² is tris(pentafluorophenyl)borane or tris(pentafluorophenyl)alumane).

Examples of these catalyst activators include trihydrocarbylammonium-salts, especially, methyldi(C_(i4-20) alkyl)ammonium-salts of:

-   bis(tris(pentafluorophenyl)borane)imidazolide, -   bis(tris(pentafluorophenyl)borane)-2-undecylimidazolide, -   bis(tris(pentafluorophenyl)borane)-2-heptadecylimidazolide, -   bis(tris(pentafluorophenyl)borane)-4,5-bis(undecyl)imidazolide, -   bis(tris(pentafluorophenyl)borane)-4,5-bis(heptadecyl)imidazolide, -   bis(tris(pentafluorophenyl)borane)imidazolinide, -   bis(tris(pentafluorophenyl)borane)-2-undecylimidazolinide, -   bis(tris(pentafluorophenyl)borane)-2-heptadecylimidazolinide, -   bis(tris(pentafluorophenyl)borane)-4,5-bis(undecyl)imidazolinide, -   bis(tris(pentafluorophenyl)borane)-4,5-bis(heptadecyl)imidazolinide, -   bis(tris(pentafluorophenyl)borane)-5,6-dimethylbenzimidazolide, -   bis(tris(pentafluorophenyl)borane)-5,6-bis(undecyl)benzimidazolide, -   bis(tris(pentafluorophenyl)alumane)imidazolide, -   bis(tris(pentafluorophenyl)alumane)-2-undecylimidazolide, -   bis(tris(pentafluorophenyl) alumane)-2-heptadecylimidazolide, -   bis(tris(pentafluorophenyl) alumane)-4,5-bis(undecyl)imidazolide, -   bis(tris(pentafluorophenyl) alumane)-4,5-bis(heptadecyl)imidazolide, -   bis(tris(pentafluorophenyl)alumane)imidazolinide, -   bis(tris(pentafluorophenyl) alumane)-2-undecylimidazolinide, -   bis(tris(pentafluorophenyl)alumane)-2-heptadecylimidazolinide, -   bis(tris(pentafluorophenyl) alumane)-4,5-bis(undecyl)imidazolinide, -   bis(tris(pentafluorophenyl)     alumane)-4,5-bis(heptadecyl)imidazolinide, -   bis(tris(pentafluorophenyl)alumane)-5,6-dimethylbenzimidazolide, and -   bis(tris(pentafluorophenyl)alumane)-5,6-bis(undecyl)benzimidazolide.

Other activators include those described in the PCT publication WO 98/07515, such as tris(2,2′,2″-nonafluorobiphenyl)fluoroaluminate. Combinations of activators are also contemplated by the disclosure, for example, alumoxanes and ionizing activators in combinations, see for example, EP-A-0 573120, PCT publications WO 94/07928 and WO 95/14044, and U.S. Pat. Nos. 5,153,157 and 5,453,410. For example, and in general terms, WO 98/09996 describes activating catalyst compounds with perchlorates, periodates and iodates, including their hydrates. WO 99/18135 describes the use of organoboroaluminum activators. WO 03/10171 discloses catalyst activators that are adducts of Brønsted acids with Lewis acids. Other activators or methods for activating a catalyst compound are described in, for example, U.S. Pat. Nos. 5,849,852, 5,859,653, and 5,869,723, in EP-A-615981, and in PCT publication WO 98/32775. All of the foregoing catalyst activators as well as any other known activator for transition metal complex catalysts may be employed alone or in combination according to the present disclosure. In one aspect, however, the co-catalyst can be alumoxane-free. In another aspect, for example, the co-catalyst can be free of any specifically-named activator or class of activators as disclosed herein.

In a further aspect, the molar ratio of catalyst/co-catalyst employed generally ranges from 1:10,000 to 100:1, for example, from 1:5000 to 10:1, or from 1:1000 to 1:1. Alumoxane, when used by itself as an activating co-catalyst, can be employed in large quantity, generally at least 100 times the quantity of metal complex on a molar basis.

Tris(pentafluorophenyl)borane, where used as an activating co-catalyst can be employed generally in a molar ratio to the metal complex of from 0.5:1 to 10:1, more preferably from 1:1 to 6:1 most preferably from 1:1 to 5:1. The remaining activating co-catalysts are generally employed in approximately equimolar quantity with the metal complex.

In exemplary embodiments of the present disclosure, the co-catalyst is [(C₁₆₋₁₈H₃₃₋₃₇)₂CH₃NH] tetrakis(pentafluorophenyl)borate salt.

Polymerization Methods

In one aspect of this disclosure, there is provided a process and the resulting polymer, the process comprising polymerizing one or more olefin monomers in the presence of an olefin polymerization catalyst and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ in a polymerization reactor or zone thereby causing the formation of at least some quantity of a polymer joined with the remnant of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. Exemplary, non-limiting polymerization processes include those known in the art, those disclosed in U.S. Pat. No. 8,501,885 B2, as well as those known in the art for producing random copolymers. Exemplary, non-limiting polymerization processes include those conducted in a single reactor or two reactors.

In yet another aspect, there is provided a process and the resulting polymer, the process comprising polymerizing one or more olefin monomers in the presence of an olefin polymerization catalyst and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ in a polymerization reactor or zone thereby causing the formation of at least some quantity of an initial polymer joined with the remnant of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ within the reactor or zone; discharging the reaction product from the first reactor or zone to a second polymerization reactor or zone operating under polymerization conditions that are distinguishable from those of the first polymerization reactor or zone; transferring at least some of the initial polymer joined with the remnant of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ to an active catalyst site in the second polymerization reactor or zone by means of at least one remaining shuttling site of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹; and conducting polymerization in the second polymerization reactor or zone so as to form a second polymer segment bonded to some or all of the initial polymer by means of a remnant of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, the second polymer segment having distinguishable polymer properties from the initial polymer segment.

During the polymerization, the reaction mixture is contacted with the activated catalyst composition according to any suitable polymerization conditions. The process can be generally characterized by use of elevated temperatures and pressures. Hydrogen may be employed as a chain transfer agent for molecular weight control according to known techniques, if desired. As in other similar polymerizations, it is generally desirable that the monomers and solvents employed be of sufficiently high purity that catalyst deactivation or premature chain termination does not occur. Any suitable technique for monomer purification such as devolatilization at reduced pressure, contacting with molecular sieves or high surface area alumina, or a combination of the foregoing processes may be employed.

Supports may be employed in the present methods, especially in slurry or gas-phase polymerizations. Suitable supports include solid, particulated, high surface area, metal oxides, metalloid oxides, or mixtures thereof (interchangeably referred to herein as an inorganic oxide). Examples include, but are not limited to talc, silica, alumina, magnesia, titania, zirconia, Sn₂O₃, aluminosilicates, borosilicates, clays, and any combination or mixture thereof. Suitable supports preferably have a surface area as determined by nitrogen porosimetry using the B.E.T. method from 10 to 1000 m²/g, and preferably from 100 to 600 m²/g. The average particle size typically is from 0.1 to 500 μm, preferably from 1 to 200 μm, more preferably 10 to 100 μm.

In one aspect of the present disclosure, the catalyst composition and optional support may be spray dried or otherwise recovered in solid, particulated form to provide a composition that is readily transported and handled. Suitable methods for spray drying a liquid containing slurry are well known in the art and usefully employed herein. Preferred techniques for spray drying catalyst compositions for use herein are described in U.S. Pat. Nos. 5,648,310 and 5,672,669.

The polymerization is desirably carried out as a continuous polymerization, for example, a continuous, solution polymerization, in which catalyst components, monomers, and optionally solvent, adjuvants, scavengers, and polymerization aids are continuously supplied to one or more reactors or zones and polymer product continuously removed therefrom. Within the scope of the terms “continuous” and “continuously” as used in this context include those processes in which there are intermittent additions of reactants and removal of products at small regular or irregular intervals, so that, over time, the overall process is substantially continuous. While the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ (if used) may be added at any point during the polymerization including in the first reactor or zone, at the exit or slightly before the exit of the first reactor, between the first reactor or zone and any subsequent reactor or zone, or even solely to the second reactor or zone; if present, both are typically added at the initial stages of the polymerization. If there exists any difference in monomers, temperatures, pressures or other polymerization conditions within a reactor or between two or more reactors or zones connected in series, polymer segments of differing composition such as comonomer content, crystallinity, density, tacticity, regio-regularity, or other chemical or physical differences, within the same molecule can be formed in the polymers of this disclosure. In such event, the size of each segment or block is determined by the polymer reaction conditions and typically is a most probable distribution of polymer sizes.

If multiple reactors are employed, each can be independently operated under high pressure, solution, slurry, or gas phase polymerization conditions. In a multiple zone polymerization, all zones operate under the same type of polymerization, such as solution, slurry, or gas phase, but, optionally, at different process conditions. For a solution polymerization process, it is desirable to employ homogeneous dispersions of the catalyst components in a liquid diluent in which the polymer is soluble under the polymerization conditions employed. One such process utilizing an extremely fine silica or similar dispersing agent to produce such a homogeneous catalyst dispersion wherein normally either the metal complex or the co-catalyst is only poorly soluble is disclosed in U.S. Pat. No. 5,783,512. A high pressure process is usually carried out at temperatures from 100° C. to 400° C. and at pressures above 500 bar (50 MPa). A slurry process typically uses an inert hydrocarbon diluent and temperatures of from 0° C. up to a temperature just below the temperature at which the resulting polymer becomes substantially soluble in the inert polymerization medium. For example, typical temperatures in a slurry polymerization are from 30° C., generally from 60° C. up to 115° C., including up to 100° C., depending on the polymer being prepared. Pressures typically range from atmospheric (100 kPa) to 500 psi (3.4 MPa).

In all of the foregoing processes, continuous or substantially continuous polymerization conditions generally are employed. The use of such polymerization conditions, especially continuous, solution polymerization processes, allows the use of elevated reactor temperatures which results in the economical production of the present block copolymers in high yields and efficiencies.

The catalyst may be prepared as a homogeneous composition by addition of the requisite metal complex or multiple complexes to a solvent in which the polymerization will be conducted or in a diluent compatible with the ultimate reaction mixture. The desired co-catalyst or activator and, optionally, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ may be combined with the catalyst composition either prior to, simultaneously with, or after combination of the catalyst with the monomers to be polymerized and any additional reaction diluent. Desirably, if present, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ is added at the same time.

At all times, the individual ingredients as well as any active catalyst composition are protected from oxygen, moisture, and other catalyst poisons. Therefore, the catalyst components, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, and activated catalysts are prepared and stored in an oxygen and moisture free atmosphere, generally under a dry, inert gas such as nitrogen.

Without limiting in any way the scope of the disclosure, one means for carrying out such a polymerization process is as follows. In one or more well stirred tank or loop reactors operating under solution polymerization conditions, the monomers to be polymerized are introduced continuously together with any solvent or diluent at one part of the reactor. The reactor contains a relatively homogeneous liquid phase composed substantially of monomers together with any solvent or diluent and dissolved polymer. Preferred solvents include C₄₋₁₀ hydrocarbons or mixtures thereof, especially alkanes such as hexane or mixtures of alkanes, as well as one or more of the monomers employed in the polymerization. Examples of suitable loop reactors and a variety of suitable operating conditions for use therewith, including the use of multiple loop reactors, operating in series, are found in U.S. Pat. Nos. 5,977,251, 6,319,989 and 6,683,149.

Catalyst along with co-catalyst and the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ are continuously or intermittently introduced in the reactor liquid phase or any recycled portion thereof at a minimum of one location. The reactor temperature and pressure may be controlled, for example, by adjusting the solvent/monomer ratio or the catalyst addition rate, as well as by use of cooling or heating coils, jackets or both. The polymerization rate can be controlled by the rate of catalyst addition. The content of a given monomer in the polymer product is influenced by the ratio of monomers in the reactor, which is controlled by manipulating the respective feed rates of these components to the reactor. The polymer product molecular weight is controlled, optionally, by controlling other polymerization variables such as the temperature, monomer concentration, or by the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, or a chain terminating agent such as hydrogen, as is known in the art.

In one aspect of the disclosure, a second reactor is connected to the discharge of a first reactor, optionally by means of a conduit or other transfer means, such that the reaction mixture prepared in the first reactor is discharged to the second reactor without substantial termination of polymer growth. Between the first and second reactors, a differential in at least one process condition may be established. Generally, for use in formation of a copolymer of two or more monomers, the difference is the presence or absence of one or more comonomers or a difference in comonomer concentration. Additional reactors, each arranged in a manner similar to the second reactor in the series may be provided as well. Further polymerization is ended by contacting the reactor effluent with a catalyst kill agent such as water, steam or an alcohol or with a coupling agent if a coupled reaction product is desired.

The resulting polymer product is recovered by flashing off volatile components of the reaction mixture such as residual monomer(s) or diluent at reduced pressure, and, if necessary, conducting further devolatilization in equipment such as a devolatilizing extruder. In a continuous process the mean residence time of the catalyst and polymer in the reactor generally is from 5 minutes to 8 hours, for example, from 10 minutes to 6 hours.

In a further aspect of this disclosure, alternatively, the foregoing polymerization may be carried out in a plug flow reactor optionally with a monomer, catalyst, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, temperature or other gradient established between differing zones or regions thereof, further optionally accompanied by separate addition of catalysts and/or the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, and operating under adiabatic or non-adiabatic polymerization conditions.

In yet a further aspect, the catalyst composition may also be prepared and employed as a heterogeneous catalyst by adsorbing the requisite components on an inert inorganic or organic particulated solid, as previously disclosed. For example, a heterogeneous catalyst can be prepared by co-precipitating the metal complex and the reaction product of an inert inorganic compound and an active hydrogen containing activator, especially the reaction product of a tri(C₁₋₄ alkyl) aluminum compound and an ammonium salt of a hydroxyaryltris(pentafluorophenyl)borate, such as an ammonium salt of (4-hydroxy-3,5-ditertiarybutylphenyl)tris(pentafluorophenyl)borate. When prepared in heterogeneous or supported form, the catalyst composition may be employed in a slurry or a gas phase polymerization. As a practical limitation, slurry polymerization takes place in liquid diluents in which the polymer product is substantially insoluble. Generally, the diluent for slurry polymerization is one or more hydrocarbons with less than 5 carbon atoms. If desired, saturated hydrocarbons such as ethane, propane, or butane may be used in whole or part as the diluent. As with a solution polymerization, the α-olefin comonomer or a combination of different α-olefin monomers may be used in whole or part as the diluent. Most preferably at least a major part of the diluent comprises the α-olefin monomer or monomers to be polymerized.

In this aspect, for use in gas phase polymerization processes, the support material and resulting catalyst typically can have a median particle diameter from 20 to 200 μm, generally from 30 μm to 150 μm, and typically from 50 μm to 100 μm. For use in slurry polymerization processes, the support can have a median particle diameter from 1 μm to 200 μm, generally from 5 μm to 100 μm, and typically from 10 μm to 80 μm.

Suitable gas phase polymerization process for use herein are substantially similar to known processes used commercially on a large scale for the manufacture of polypropylene, ethylene/α-olefin copolymers, and other olefin polymers. The gas phase process employed can be, for example, of the type which employs a mechanically stirred bed or a gas fluidized bed as the polymerization reaction zone. Preferred is the process wherein the polymerization reaction is carried out in a vertical cylindrical polymerization reactor containing a fluidized bed of polymer particles supported or suspended above a perforated plate or fluidization grid, by a flow of fluidization gas. Suitable gas phase processes which are adaptable for use in the process of this disclosure are disclosed in, for example, U.S. Pat. Nos. 4,588,790; 4,543,399; 5,352,749; 5,436,304; 5,405,922; 5,462,999; 5,461,123; 5,453,471; 5,032,562; 5,028,670; 5,473,028; 5,106,804; 5,556,238; 5,541,270; 5,608,019; and 5,616,661.

The use of functionalized derivatives of polymers are also included within the present disclosure. Examples include metallated polymers wherein the metal is the remnant of the catalyst or the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ employed, as well as further derivatives thereof. Because a substantial fraction of the polymeric product exiting the reactor is terminated with the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, further functionalization is relatively easy. The metallated polymer species can be utilized in well known chemical reactions such as those suitable for other alkyl-aluminum, alkyl-gallium, alkyl-zinc, or alkyl-Group 1 compounds to form amine-, hydroxy-, epoxy-, silane, vinylic, and other functionalized terminated polymer products. Examples of suitable reaction techniques that are adaptable for use herein are described in Negishi, “Organometallics in Organic Synthesis”, Vol. 1 and 2, (1980), and other standard texts in organometallic and organic synthesis.

Polymer Products

As disclosed herein, the polymer products refer to polymer products, after polymerization, that are typically subjected to chemical treatment to consume reactive metal alkyl groups and liberate the polymer products from attachment to transition group or main group metals. This process comprises hydrolysis with water to generate saturated polymer end groups. Alternatively, addition of various organic or inorganic reagents may be added to both consume the metal alkyl groups and generate reactive functional end groups on the polymer chains.

Suitable monomers for use in preparing the copolymers of the present disclosure include any addition polymerizable monomer, generally any olefin or diolefin monomer. Suitable monomers can be linear, branched, acyclic, cyclic, substituted, or unsubstituted. In one aspect, the olefin can be any α-olefin, including, for example, ethylene and at least one different copolymerizable comonomer, propylene and at least one different copolymerizable comonomer having from 4 to 20 carbons, or 4-methyl-1-pentene and at least one different copolymerizable comonomer having from 4 to 20 carbons. Examples of suitable monomers include, but are not limited to, straight-chain or branched α-olefins having from 2 to 30 carbon atoms, from 2 to 20 carbon atoms, or from 2 to 12 carbon atoms. Specific examples of suitable monomers include, but are not limited to, ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexane, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene. Suitable monomers for use in preparing the copolymers disclosed herein also include cycloolefins having from 3 to 30, from 3 to 20 carbon atoms, or from 3 to 12 carbon atoms. Examples of cycloolefins that can be used include, but are not limited to, cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, and 2-methyl-1,4,5,8-dimethano-1,2,3,4,4a,5,8,8a-octahydronaphthalene. Suitable monomers for preparing the copolymers disclosed herein also include di- and poly-olefins having from 3 to 30, from 3 to 20 carbon atoms, or from 3 to 12 carbon atoms. Examples of di- and poly-olefins that can be used include, but are not limited to, butadiene, isoprene, 4-methyl-1,3-pentadiene, 1,3-pentadiene, 1,4-pentadiene, 1,5-hexadiene, 1,4-hexadiene, 1,3-hexadiene, 1,3-octadiene, 1,4-octadiene, 1,5-octadiene, 1,6-octadiene, 1,7-octadiene, ethylidene norbornene, vinyl norbornene, dicyclopentadiene, 7-methyl-1,6-octadiene, 4-ethylidene-8-methyl-1,7-nonadiene, and 5,9-dimethyl-1,4,8-decatriene. In a further aspect, aromatic vinyl compounds also constitute suitable monomers for preparing the copolymers disclosed here, examples of which include, but are not limited to, mono- or poly-alkylstyrenes (including styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, o,p-dimethylstyrene, o-ethylstyrene, m-ethylstyrene and p-ethylstyrene), and functional group-containing derivatives, such as methoxystyrene, ethoxystyrene, vinylbenzoic acid, methyl vinylbenzoate, vinylbenzyl acetate, hydroxystyrene, o-chlorostyrene, p-chlorostyrene, divinylbenzene, 3-phenylpropene, 4-phenylpropene and α-methylstyrene, vinylchloride, 1,2-difluoroethylene, 1,2-dichloroethylene, tetrafluoroethylene, and 3,3,3-trifluoro-1-propene, provided the monomer is polymerizable under the conditions employed.

Further, in one aspect, suitable monomers or mixtures of monomers for use in combination with at least the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ disclosed here include ethylene; propylene; mixtures of ethylene with one or more monomers selected from propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and styrene; and mixtures of ethylene, propylene and a conjugated or non-conjugated diene. In this aspect, the copolymer or interpolymer can contain two or more intramolecular regions comprising differing chemical or physical properties, especially regions of differentiated comonomer incorporation, joined in a dimeric, linear, branched or polybranched polymer structure. Such polymers may be prepared by altering the polymerization conditions during a polymerization that includes the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, for example by using two reactors with differing comonomer ratios, multiple catalysts with differing comonomer incorporation abilities, or a combination of such process conditions, and optionally a polyfunctional coupling agent.

Utilizing the polymerization processes disclosed here, novel polymer compositions, including block copolymers of one or more olefin monomers having the present molecular weight distribution, are readily prepared. Desirable polymers comprise in polymerized form at least one monomer selected from ethylene, propylene, and 4-methyl-1-pentene. Highly desirably, the polymers are interpolymers comprising in polymerized form ethylene, propylene, or 4-methyl-1-pentene and at least one different C₂₋₂₀ α-olefin comonomer, and optionally one or more additional copolymerizable comonomers. Suitable comonomers are selected from diolefins, cyclic olefins, and cyclic diolefins, halogenated vinyl compounds, vinylidene aromatic compounds, and combinations thereof. Generally preferred polymers are interpolymers of ethylene with 1-butene, 1-hexene or 1-octene. Illustratively, the polymer compositions disclosed here have an ethylene content from 1 to 99 percent, a diene content from 0 to 10 percent, and a styrene and/or C₃₋₈ α-olefin content from 99 to 1 percent, based on the total weight of the polymer. Typically, the polymers of the present disclosure have a weight average molecular weight (Mw) from 500 to 250,000 (e.g., from 2,000 to 150,000, from 3,000 to 100,000, from 1,000 to 25,000, from 5,000 to 25,000, etc.).

The density of the polymers of this disclosure can be from 0.80 to 0.99 g/cm³ and typically, for ethylene containing polymers, from 0.85 g/cm³ to 0.97 g/cm³ (e.g., from 0.853-0.970 g/cm³).

The polymers according to this disclosure may be differentiated from conventional, random copolymers, physical blends of polymers, and block copolymers prepared via sequential monomer addition, fluxional catalysts, or by anionic or cationic living polymerization techniques, by, among other things, their narrow molecular weight distributions. In this aspect, for example, the polymer composition prepared according to this disclosure can be characterized by a polydispersity index (PDI) of from 1.5 to 3.0. For example, the polydispersity index (PDI) of the polymer composition can be from 1.5 to 2.8, from 1.5 to 2.5, or from 1.5 to 2.3.

If present, the separate regions or blocks within each polymer are relatively uniform, depending on the uniformity of reactor conditions, and chemically distinct from each other. That is, the comonomer distribution, tacticity, or other property of segments within the polymer are relatively uniform within the same block or segment. However, the average block length can be a narrow distribution, but is not necessarily so. The average block length can also be a most probable distribution.

In a further aspect, the resulting polymer may be linear or contain one or more branching centers, depending on whether a two-centered-, three-centered-, or higher centered shuttling agent is employed. Illustratively, these interpolymers can be characterized by terminal blocks or segments of polymer having higher tacticity or crystallinity from at least some remaining blocks or segments. Illustratively, the polymer can be a triblock copolymer containing a central polymer block or segment that is relatively amorphous or even elastomeric.

In a still further aspect of this disclosure, there is provided a polymer composition comprising: (1) an organic or inorganic polymer, preferably a homopolymer of ethylene or of propylene and/or a copolymer of ethylene or propylene with one or more copolymerizable comonomers, and (2) a polymer or combination of polymers according to the present disclosure or prepared according to the process disclosed here.

The inventive polymer products include combinations of two or more polymers comprising regions or segments (blocks) of differing chemical composition. In addition, at least one of the constituents of the polymer combination can contain a linking group which is the remnant of the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹, causing the polymer to possess certain physical properties.

Various additives may be usefully incorporated into the present compositions in amounts that do not detract from the properties of the resultant composition. These additives include, for example, reinforcing agents, fillers including conductive and non-conductive materials, ignition resistant additives, antioxidants, heat and light stabilizers, colorants, extenders, crosslinkers, blowing agents, plasticizers, flame retardants, anti-drip agents, lubricants, slip additives, anti-blocking aids, anti-degradants, softeners, waxes, pigments, and the like, including combinations thereof.

The resultant polymers may be block interpolymers that can be characterized by an average block index, e.g., as discussed in U.S. Pat. Nos. 7,947,793, 7,897,698, and 8,293,859. The resultant polymers may be block composites that can be characterized by a block composite index, e.g., as discussed in U.S. Pat. Nos. 8,563,658, 8,476,366, 8,686,087, and 8,716,400. The resultant polymers may be crystalline block composites that can be characterized by a crystalline block composite index, e.g., as discussed in U.S. Pat. Nos. 8,785,554, 8,822,598, and 8,822,599. The resultant polymers may be specified block composites that can be characterized by a microstructure index, e.g., as discussed in PCT/US15/046002. The resultant polymers may be specified block composites that can be characterized by a modified block composite, e.g., as discussed in PCT/US15/046031.

In certain embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ may be combined with functionalization chemistry to develop telechelic olefin prepolymers. In certain embodiments, the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ can generate and grow telechelic polymer chains with both ends bonded to the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹; subsequent transformation of the terminal polymeryl-metal bonds to desired di-end-functional groups may then occur to form the telechelic polymer.

Applications of the combination of the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ of the present disclosure with functionalization chemistry are in no way limited to development of telechelic olefin prepolymers and the above example. In certain embodiments, the process for preparing the composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ of the present disclosure may be combined with, e.g., coordinative chain transfer polymerization, to produce functionalized polyolefins.

EXAMPLES

Test Methods

In the following examples, standard analytical equipment and methods are used.

¹H and ¹³C Nuclear Magnetic Resonance (NMR) ¹H NMR:

¹H NMR spectra were recorded on a Bruker AV-400 spectrometer at ambient temperature. ¹H NMR chemical shifts in benzene-d₆ were referenced to 7.16 ppm (C₆D₅H) relative to TMS (0.00 ppm). Samples were prepared by dissolving 0.2 ml of reaction mixture in 1 ml of benzene-d₆. ¹³C NMR: ¹³C NMR spectra of polymers were collected using a Bruker 400 MHz spectrometer equipped with a Bruker Dual DUL high-temperature CryoProbe. The polymer samples were prepared by adding approximately 2.6 g of a 50/50 mixture of tetrachloroethane-d₂/orthodichlorobenzene containing 0.025M chromium trisacetylacetonate (relaxation agent) to 0.2 g of polymer in a 10 mm NMR tube. The samples were dissolved and homogenized by heating the tube and its contents to 150° C. The data was acquired using 320 scans per data file, with a 7.3 second pulse repetition delay with a sample temperature of 120° C.

Gas Chromatograph-Mass Spectroscopy (GCMS):

Tandem gas chromatography/low resolution mass spectroscopy using electron impact ionization (EI) was performed at 70 eV on an Agilent Technologies 6890N series gas chromatograph equipped with an Agilent Technologies 5975 inert XL mass selective detector and an Agilent Technologies Capillary column (HP1MS, 15 m×0.25 mm, 0.25 micron). Aliquots of compositions of the present disclosure were quenched by water and deuterated methanol separately and analyzed by GCMS using two different methods to ensure detection of molecules in the molecular weight range from 100 up to 600. The two methods are as follows:

Method 1

30° C. for 5 min

then 5° C./min to 50° C. for 0 min

then 20° C./min to 150° C. for 1 min

Run Time 15 min

Method 2

50° C. for 0 min

then 25° C./min to 300° C. for 10 min

Run Time 20 min

Density is measured in accordance with ASTM D-792. The result is reported in gamma (g) per cubic centimeter, or g/cc.

Melt index (I₂) is measured in accordance with ASTM D-1238 (190° C.; 2.16 kg). The result is reported in grams/10 minutes. Melt flow rate (MFR) is measured in accordance with ASTM D-1238 (230° C.; 2.16 kg). The result is reported in grams/10 minutes.

Melt flow rate (MFR) is measured in accordance with ASTM D-1238 (230° C.; 2.16 kg). The result is reported in grams/10 minutes.

Molecular weight distribution (MWD) is measured using Gel Permeation Chromatography (GPC). In particular, conventional GPC measurements are used to determine the weight-average (Mw) and number-average (Mn) molecular weight of the polymer, and to determine the MWD (which is calculated as Mw/Mn). Samples are analyzed with a high-temperature GPC instrument (Polymer Laboratories, Inc. model PL220). The method employs the well-known universal calibration method, based on the concept of hydrodynamic volume, and the calibration is performed using narrow polystyrene (PS) standards, along with four Mixed A 20 μm columns (PLgel Mixed A from Agilent (formerly Polymer Laboratory Inc.)) operating at a system temperature of 140° C. Samples are prepared at a “2 mg/mL” concentration in 1,2,4-trichlorobenzene solvent. The flow rate is 1.0 mL/min, and the injection size is 100 microliters.

As discussed, the molecular weight determination is deduced by using narrow molecular weight distribution polystyrene standards (from Polymer Laboratories) in conjunction with their elution volumes. The equivalent polyethylene molecular weights are determined by using appropriate Mark-Houwink coefficients for polyethylene and polystyrene (as described by Williams and Ward in Journal of Polymer Science, Polymer Letters, Vol. 6, (621) 1968) to derive the following equation: Mpolyethylene=a*(Mpolystyrene)^(b). In this equation, a=0.4316 and b=1.0 (as described in Williams and Ward, J. Polym. Sc., Polym. Let., 6, 621 (1968)). Polyethylene equivalent molecular weight calculations were performed using VISCOTEK TriSEC software Version 3.0.

Differential Scanning Calorimetry (DSC) is used to measure crystallinity in the polymers (e.g., polyethylene (PE) polymers). About 5 to 8 mg of polymer sample is weighed and placed in a DSC pan. The lid is crimped on the pan to ensure a closed atmosphere. The sample pan is placed in a DSC cell, and then heated, at a rate of approximately 10° C./min, to a temperature of 180° C. for PE (230° C. for polypropylene or “PP”). The sample is kept at this temperature for three minutes. Then the sample is cooled at a rate of 10° C./min to −60° C. for PE (−40° C. for PP), and kept isothermally at that temperature for three minutes. The sample is next heated at a rate of 10° C./min, until complete melting (second heat). The percent crystallinity is calculated by dividing the heat of fusion (H_(f)), determined from the second heat curve, by a theoretical heat of fusion of 292 J/g for PE (165 J/g, for PP), and multiplying this quantity by 100 (for example, % cryst.=(H_(f)/292 J/g)×100 (for PE)).

Unless otherwise stated, melting point(s) (T_(m)) of each polymer is determined from the second heat curve (peak Tm), and the crystallization temperature (T_(c)) is determined from the first cooling curve (peak Tc).

High Temperature Liquid Chromatography:

High Temperature Liquid Chromatography Experimental Method Instrumentation is the HTLC experiment, which is done according to the published method with minor modifications (Lee, D.; Miller, M. D.; Meunier, D. M.; Lyons, J. W.; Bonner, J. M.; Pell, R. J.; Shan, C. L. P.; Huang, T. J. Chromatogr. A 2011, 1218, 7173). Two Shimadzu (Columbia, Md., USA) LC-20AD pumps are used to deliver decane and trichlorobenzene (TCB) respectively. Each pump is connected to a 10:1 fixed flow splitter (Part #: 620-PO20-HS, Analytical Scientific Instruments Inc., CA, USA). The splitter has a pressure drop of 1500 psi at 0.1 mL/min in H₂O according to the manufacturer. The flow rates of both pumps are set at 0.115 mL/min. After the splitting, the minor flow is 0.01 mL/min for both decane and TCB, determined by weighing the collected solvents for more than 30 min. The volume of the collected eluent is determined by the mass and the densities of the solvents at room temperature. The minor flow is delivered to the HTLC column for separation. The main flow is sent back to the solvent reservoir. A 50-μL mixer (Shimadzu) is connected after the splitters to mix the solvents from Shimadzu pumps. The mixed solvents are then delivered to the injector in the oven of Waters (Milford, Mass., USA) GPCV2000. A Hypercarb™ column (2.1×100 mm, 5 μm particle size) is connected between the injector and a 10-port VICI valve (Houston, Tex., USA). The valve is equipped with two 60-L sample loops. The valve is used to continuously sample eluent from the first dimension (D1) HTLC column to the second dimension (D2) SEC column. The pump of Waters GPCV2000 and a PLgel Rapid™-M column (10×100 mm, 5 μm particle size) are connected to the VICI valve for D2 size exclusion chromatography (SEC). The symmetric configuration is used for the connections as described in the literature (Brun, Y.; Foster, P. J. Sep. Sci. 2010, 33, 3501). A dual-angle light scattering detector (PD2040, Agilent, Santa Clara, Calif., USA) and an IR5 inferred absorbance detector are connected after the SEC column for measurement of concentration, composition, and molecular weight.

Separation for HTLC:

Approximately 30 mg are dissolved in 8-mL decane by gently shaking the vial at 160° C. for 2 hours. The decane contains 400 ppm BHT(2,6-Di-tert-butyl-4-methylphenol) as the radical scavenger. The sample vial is then transferred to the autosampler of GPCV2000 for injection. The temperatures of the autosampler, the injector, both the Hypercarb and the PLgel columns, the 10-port VICI valve, and both the LS and IR5 detectors are maintained at 140° C. throughout the separation.

The initial conditions before injection are as follows. The flow rate for the HTLC column is 0.01 mL/min. The solvent composition in the D1 Hypercarb column is 100% decane. The flow rate for the SEC column is 2.51 mL/min at room temperature. The solvent composition in the D2 PLgel column is 100% TCB. The solvent composition in the D2 SEC column does not change throughout the separation.

A 311-μL aliquot of sample solution is injected into the HTLC column. The injection triggers the gradient described below:

From 0-10 min, 100% decane/0% TCB;

From 10-651 min, TCB is increased linearly from 0% TCB to 80% TCB.

The injection also triggers the collection of the light scattering signal at 15° angle (LS15) and the “measure” and “methyl” signals from IR5 detector (IR_(measure) and IR_(methyl)) using EZChrom™ chromatography data system (Agilent). The analog signals from detectors are converted to digital signals through a SS420X analog-to-digital converter. The collection frequency is 10 Hz. The injection also triggers the switch of the 10-port VICI valve. The switch of the valve is controlled by the relay signals from the SS420X converter. The valve is switched every 3 min. The chromatograms are collected from 0 to 651 min. Each chromatogram consist of 651/3=217 SEC chromatograms.

After the gradient separation, 0.2 mL of TCB and 0.3 mL of decane are used to clean and re-equilibrate the HTLC column for next separation. The flow rate of this step is 0.2 mL/min, delivered by a Shimadzu LC-20 AB pump connected to the mixer.

Data Analysis for HTLC:

The 651 min raw chromatogram is first unfolded to give 217 SEC chromatograms. Each chromatogram is from 0 to 7.53 mL in the unit of 2D elution volume. The integration limit is then set and the SEC chromatograms undergo spike removal, baseline correction, and smoothing. The process is similar to batch analysis of multiple SEC chromatograms in conventional SEC. The sum of all the SEC chromatograms is inspected to ensure both left side (upper integration limit) and right side (lower integration limit) of the peak were at the baseline as zero. Otherwise, the integration limit is adjusted to repeat the process.

Each SEC chromatogram n from 1 to 217 yields an X—Y pair in the HTLC chromatogram, where n is the fraction number:

X_(n)=elution volume (mL)=D1 flow rate×n×t_(switch)

where t_(switch)=3 min is the switch time of the 10-port VICI valve.

$Y_{n} = {{{signal}\mspace{14mu}{intensity}\mspace{14mu}({Voltage})} = {\sum\limits_{{peak}\mspace{14mu}{start}}^{{peak}\mspace{14mu}{end}}\;{IR}_{{measure},n}}}$

The above equation uses IR_(measure) signal as the example. The obtained HTLC chromatogram shows the concentrations of the separated polymeric components as a function of elution volume.

X—Y pairs of data are also obtained from IR_(methyl) and LS15 signals. The ratio of IR_(methyl)/IR_(measure) is used to calculate composition after calibration. The ratio of LS15/IR_(measure) is used to calculate weight-average molecular weight (M_(w)) after calibration.

Calibration follows the procedures of Lee et al., ibid. High density polyethylene (HDPE), isotactic polypropylene (iPP), and ethylene-propylene copolymer with propylene contents of 20.0, 28.0, 50.0, 86.6, 92.0, and 95.8 wt % P are used as the standards for IR_(methyl)/IR_(measure) calibration. The composition of the standards are determined by NMR. The standards are run by SEC with IR5 detector. The obtained IR_(methyl)/IR_(measure) ratios of the standards are plotted as a function of their compositions, yielding the calibration curve.

The HDPE reference is used for routine LS15 calibration. The M_(w) of the reference is predetermined by GPC as 104.2 kg/mol with LS and RI (refractive index) detectors. GPC uses NBS 1475 as the standard in GPC. The standard has a certified value of 52.0 kg/mol by NIST. Between 7 to 10 mg of the standard is dissolved in 8-mL decane at 160° C. The solution is injected to the HTLC column in 100% TCB. The polymer is eluted under constant 100% TCB at 0.01 mL/min. Therefore, the peak of the polymer appears at the HTLC column void volume. A calibration constant, Q, is determined from the total LS15 signals (A_(LS15)) and the total IR_(measure) signals (A_(IR,measure)):

$\Omega = \frac{A_{{LS}\; 15}}{A_{{IR},{measure}}M_{w}}$

The experimental LS15/IR_(measure) ratio is then converted to M_(w) through Ω.

Gel permeation chromatographic (GPC) system consists of either a Polymer Laboratories Model PL-210 or a Polymer Laboratories Model PL-220 instrument. The column and carousel compartments are operated at 140° C. Three Polymer Laboratories 10-micron Mixed-B columns are used. The solvent is 1,2,4 trichlorobenzene. The samples are prepared at a concentration of 0.1 grams of polymer in 50 milliliters of solvent containing 200 ppm of butylated hydroxytoluene (BHT). Samples are prepared by agitating lightly for 2 hours at 160° C. The injection volume used is 100 microliters and the flow rate is 1.0 ml/minute.

Calibration of the GPC column set is performed with 21 narrow molecular weight distribution polystyrene standards with molecular weights ranging from 580 to 8,400,000, arranged in 6 “cocktail” mixtures with at least a decade of separation between individual molecular weights. The standards are purchased from Polymer Laboratories (Shropshire, UK). The polystyrene standards are prepared at 0.025 grams in 50 milliliters of solvent for molecular weights equal to or greater than 1,000,000, and 0.05 grams in 50 milliliters of solvent for molecular weights less than 1,000,000. The polystyrene standards are dissolved at 80° C. with gentle agitation for 30 minutes. The narrow standards mixtures are run first and in order of decreasing highest molecular weight component to minimize degradation. The polystyrene standard peak molecular weights are converted to polyethylene molecular weights using the following equation (as described in Williams and Ward, J. Polym. Sci., Polym. Let., 6, 621 (1968)): M _(polypropylene)=0.645(M _(polystyrene)).

Working Example 1

Anhydrous toluene is obtained from Sigma-Aldrich and further dried over alumina, which is activated in a 275° C. oven for 5 hours. Norbornadiene and 5-vinyl-2-norbernene are obtained from Sigma-Aldrich and dried over activated alumina (DD6) before use.

All reactions are performed in a dry box under an atmosphere of nitrogen unless otherwise stated. Norbornadiene (1.18 mL, 11.7 mmol) and diethylzinc (1.5 mL, 14.6 mmol) are added to toluene (35 mL) and mixed in a 100 mL glass bottle equipped with a stir bar under nitrogen atmosphere and cooled to 0° C. Subsequently, ammonium tetrakis(pentafluorophenyl)borate (1.8 mL of 0.0644 M solution, 0.12 mmol) and Catalyst (A2) (47 mg dissolved in 10 mL toluene, 0.097 mmol) are added and the mixture is stirred at room temperature overnight to form a final solution containing a composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹. The final solution is calculated to consist of a zinc concentration of 0.3 M and a hafnium concentration of 0.00198 M. A sample is taken for ¹H NMR analysis and additional samples are hydrolyzed with water/HCl and deuterated methanol for GCMS analysis.

As seen in FIG. 4, ¹H NMR analysis shows that norbomadiene is completely consumed after overnight reaction and that the diethylzinc peaks are greatly diminished, providing evidence of reaction between norbornadiene and diethylzinc.

GCMS analysis is performed via two methods, as described above, for structural evidence of compounds based on molecular weight, one suitable for detecting low molecular weight fractions (Method 1) and one for high molecular weight fractions (Method 2). FIGS. 5 and 6 exhibit GCMS analysis of the samples hydrolyzed by water/HCl for Methods 1 and 2, respectively. As seen in FIGS. 5 and 6, both methods show a major group of peaks at m/z=152, consistent with the molecular weight of the expected dual-headed species, and a minor group of peaks at m/z=166. No products in the lower or higher molecular weight range are observed. The absence of any peaks at higher molecular weights is strong evidence that consecutive insertion of more than one diene is successfully prevented. The multiplicity of the peaks is believed to be the result of several possible isomers of the products.

With reference to FIGS. 5 and 6, the intensity of the minor group of peaks at m/z=166 is found to be not reproducible and varies in connection with different quenches of the same solution. Indeed, as seen in FIG. 7, use of a cleanly deoxygenated quenching agent (methanol) in a drybox eliminates these peaks. Accordingly, it is believed that the minor group of peaks at m/z=166 results from incomplete hydrolysis of the 152 species. In this regard, FIG. 8, Scheme 1, shows the plausible reactions for the samples hydrolyzed by water.

To further verify the “dual headed” structure of the 152 species shown in FIGS. 5 and 6, samples are hydrolyzed with deuterated methanol CD₃OD and analyzed via GCMS Method 2, as seen in FIG. 9. As anticipated, the 152 peaks shift to 154, which is strong evidence that the molecule is attached to two zinc atoms before hydrolysis, and the 166 peaks similarly shift to 167. Accordingly, FIG. 8, in Schemes 2 and 3, shows the plausible reactions for the samples hydrolyzed by deuterated methanol CD₃OD.

Polymerization Evaluation

Ethylene-octene copolymerization reactions are conducted in a one gallon batch reactor at 120° C., as shown below in Table 1. DHC, as indicated in Table 1, refers to the dual-headed composition having the formula R¹M^(A)[R²M^(A)-]_(N)R¹ of Working Example 1. Catalyst (A2) is as defined above.

TABLE 1 EO copolymerization in batch reactor Catalyst (A2)* DHC Temp Ethylene Octene Yield Calc (μmoles) (mmoles) (° C.) (g) (g) (g) Mn** Mn Mw Mw/Mn wt % C8 0.38 0 120 148 260 8.5 — 127,702 400,985 3.14 6.41 3.2 0.48 120 146 264 24.1 50208 74,703 155,659 2.08 6.75 1.6 0.24 120 151 265 14.4 60000 74,149 190,329 2.57 5.22 1.2 0.18 120 148 261 17.7 98333 86,318 229,990 2.66 6.72 2.0 0.3 133 139 269 19.9 66333 75,344 182,275 2.42 8.95 4.0 0.6 134 137 265 34.6 57667 60,891 141,630 2.33 9.38 10 1.5 134 140 265 52.2 34800 40,956 114,050 2.78 10.24 16 2.4 135 135 265 60.1 25041 26,303 91,916 3.49 10.87 *Catalyst (A2) was supplied from the final solution of Working Example 1 (i.e., no fresh catalyst was added). **Calculated by dividing polymer yield (g) by concentration of Zinc.

As seen in Table 1, the dual-headed composition of Working Example 1 demonstrated effective chain transfer ability causing reduction of molecular weight. The measured Mn values are roughly comparable to the calculated Mn based on the “dual-headed” structure. The transition metal catalyst from the final solution remained active in polymerization and performed similarly as fresh catalyst as evidenced by the same conomoner incorporation, thereby validating the one-pot nature of the process of the present disclosure. In addition, the Mark-Houwink plots did not indicate presence of long chain branches, further confirming that multi-insertion of the diene in preparation of the dual-headed composition is prevented.

In addition, GPC curves of EO copolymer made with the dual-headed composition of Working Example 1 are shown in FIG. 10, showing that the dual-headed composition causes shift of the curves to lower molecular weights. Further examples including other sterically hindered dienes, such as 5-vinyl-2-norbornene, and other catalyst precursors, such as Catalyst (A4)-(A7) as defined above, produced similar results as Working Example 1 based on similar preparations and conditions as Working Example 1. Specifically, FIG. 11 provides the ¹H NMR analysis showing that near complete consumption of 5-vinyl-2-norbornene occurs after reaction with diethylzinc and Catalyst (A2). FIG. 12 provides the GCMS analysis showing a hydrolyzed composition of 152 species based on reaction of norbornadiene and diethylzinc with Catalyst (A5). FIGS. 13 and 14 provide the GCMS analysis showing a hydrolyzed composition of 152 species based on reaction of norbornadiene and diethylzinc with Catalyst (A7). FIGS. 15 and 16 provide GCMS analysis showing a hydrolyzed composition of 152 species based on reaction of norbornadiene and diethylzinc with Catalyst (A6). While not provided, GCMS analysis also shows a hydrolyzed composition of 152 species based on reaction of norbornadiene and diethylzinc with Catalyst (A4). With regard to FIGS. 12, 13, and 15, it is believed that the 122 species is a minor component having the isomeric structures of (A) and (B), as shown in FIG. 17. 

What is claimed is:
 1. A process for preparing a composition comprising the steps of: contacting a sterically hindered diene with an organometallic compound, a solvent, a catalyst precursor, and a co-catalyst to form a solution containing the composition, wherein the composition has the formula: R¹M^(A)[R²M^(A)-]_(N)R¹, or an aggregate thereof, a Lewis base-containing derivative thereof, or any combination thereof; wherein: M^(A) in each occurrence is Zn, Mg, Ga, B, or Al; R¹ in each occurrence is independently selected from hydrogen, alkyl, halide, amide, hydrocarbyl, hydrocarbylamide, dihydrocarbylamide, hydrocarbyloxide, hydrocarbylsulfide, dihydrocarbylphosphido, tri(hydrocarbyl)silyl; any hydrocarbyl group being optionally substituted with at least one halide, amide, hydrocarbylamide, dihydrocarbylamide, or hydrocarbyloxide; and each carbon-containing R¹ having from 1 to 50 carbon atoms, inclusive; R² in each occurrence is a derivative of the sterically hindered diene; and N, on average, in each occurrence is a number from 1-150, inclusive.
 2. The process of claim 1, wherein Win each occurrence is hydrogen or a C1-20 alkyl group.
 3. The process of claim 1, wherein the organometallic compound is an organozinc compound.
 4. The process of claim 1, wherein the sterically hindered diene is selected from the group consisting of dicyclopentadiene, 5-vinyl-2-norbornene, norbornadiene, derivatives of bis-norbornene, and combinations thereof.
 5. The process of claim 1, wherein the solvent is toluene or an aliphatic hydrocarbon. 